diff --git a/apps/docs/content/(01-linear-structures)/binary-search/153-find-minimum-in-rotated-sorted-array.mdx b/apps/docs/content/(01-linear-structures)/binary-search/153-find-minimum-in-rotated-sorted-array.mdx
index 5e1a2f0..8c96a32 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/153-find-minimum-in-rotated-sorted-array.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/153-find-minimum-in-rotated-sorted-array.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "nIVW4P8b1VA"
+issue: "https://github.com/prdlk/leetcode/issues/62"
 sidebar:
   label: 'Find Minimum in Rotated Sorted Array'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/binary-search/33-search-in-rotated-sorted-array.mdx b/apps/docs/content/(01-linear-structures)/binary-search/33-search-in-rotated-sorted-array.mdx
index bcbdd4d..aeaf3b5 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/33-search-in-rotated-sorted-array.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/33-search-in-rotated-sorted-array.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "U8XENwh8Oy8"
+issue: "https://github.com/prdlk/leetcode/issues/60"
 sidebar:
   label: 'Search in Rotated Sorted Array'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/binary-search/35-search-insert-position.mdx b/apps/docs/content/(01-linear-structures)/binary-search/35-search-insert-position.mdx
index 06fde0d..c08b610 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/35-search-insert-position.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/35-search-insert-position.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "K-RYzDZkzCI"
+issue: "https://github.com/prdlk/leetcode/issues/63"
 sidebar:
   label: 'Search Insert Position'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/binary-search/704-binary-search.mdx b/apps/docs/content/(01-linear-structures)/binary-search/704-binary-search.mdx
index 4aea8ac..0015dc8 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/704-binary-search.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/704-binary-search.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "s4DPM8ct1pI"
+issue: "https://github.com/prdlk/leetcode/issues/58"
 sidebar:
   label: 'Binary Search'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/binary-search/74-search-a-2d-matrix.mdx b/apps/docs/content/(01-linear-structures)/binary-search/74-search-a-2d-matrix.mdx
index 9a8de6e..1e285a9 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/74-search-a-2d-matrix.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/74-search-a-2d-matrix.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Binary Search", slug: "binary-search" }
   - { name: "Matrix", slug: "matrix" }
 video: "Ber2pi2C0j0"
+issue: "https://github.com/prdlk/leetcode/issues/61"
 sidebar:
   label: 'Search a 2D Matrix'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/binary-search/875-koko-eating-bananas.mdx b/apps/docs/content/(01-linear-structures)/binary-search/875-koko-eating-bananas.mdx
index 6b7cac8..55f7c8f 100644
--- a/apps/docs/content/(01-linear-structures)/binary-search/875-koko-eating-bananas.mdx
+++ b/apps/docs/content/(01-linear-structures)/binary-search/875-koko-eating-bananas.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "U2SozAs9RzA"
+issue: "https://github.com/prdlk/leetcode/issues/59"
 sidebar:
   label: 'Koko Eating Bananas'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/hash-table/1-two-sum.mdx b/apps/docs/content/(01-linear-structures)/hash-table/1-two-sum.mdx
index 82df13d..fb9b7f7 100644
--- a/apps/docs/content/(01-linear-structures)/hash-table/1-two-sum.mdx
+++ b/apps/docs/content/(01-linear-structures)/hash-table/1-two-sum.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Hash Table", slug: "hash-table" }
 video: "KLlXCFG5TnA"
+issue: "https://github.com/prdlk/leetcode/issues/29"
 sidebar:
   label: 'Two Sum'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/hash-table/217-contains-duplicate.mdx b/apps/docs/content/(01-linear-structures)/hash-table/217-contains-duplicate.mdx
index e8ef07f..f8b5398 100644
--- a/apps/docs/content/(01-linear-structures)/hash-table/217-contains-duplicate.mdx
+++ b/apps/docs/content/(01-linear-structures)/hash-table/217-contains-duplicate.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Hash Table", slug: "hash-table" }
   - { name: "Sorting", slug: "sorting" }
 video: "3OamzN90kPg"
+issue: "https://github.com/prdlk/leetcode/issues/27"
 sidebar:
   label: 'Contains Duplicate'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/hash-table/242-valid-anagram.mdx b/apps/docs/content/(01-linear-structures)/hash-table/242-valid-anagram.mdx
index fc850c1..2dfcf22 100644
--- a/apps/docs/content/(01-linear-structures)/hash-table/242-valid-anagram.mdx
+++ b/apps/docs/content/(01-linear-structures)/hash-table/242-valid-anagram.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Sorting", slug: "sorting" }
 video: "9UtInBqnCgA"
+issue: "https://github.com/prdlk/leetcode/issues/28"
 sidebar:
   label: 'Valid Anagram'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/hash-table/347-top-k-frequent-elements.mdx b/apps/docs/content/(01-linear-structures)/hash-table/347-top-k-frequent-elements.mdx
index 797cfca..5e344ba 100644
--- a/apps/docs/content/(01-linear-structures)/hash-table/347-top-k-frequent-elements.mdx
+++ b/apps/docs/content/(01-linear-structures)/hash-table/347-top-k-frequent-elements.mdx
@@ -12,6 +12,7 @@ topics:
   - { name: "Counting", slug: "counting" }
   - { name: "Quickselect", slug: "quickselect" }
 video: "YPTqKIgVk-k"
+issue: "https://github.com/prdlk/leetcode/issues/31"
 sidebar:
   label: 'Top K Frequent Elements'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/hash-table/49-group-anagrams.mdx b/apps/docs/content/(01-linear-structures)/hash-table/49-group-anagrams.mdx
index fb2b250..fe121e2 100644
--- a/apps/docs/content/(01-linear-structures)/hash-table/49-group-anagrams.mdx
+++ b/apps/docs/content/(01-linear-structures)/hash-table/49-group-anagrams.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Sorting", slug: "sorting" }
 video: "vzdNOK2oB2E"
+issue: "https://github.com/prdlk/leetcode/issues/30"
 sidebar:
   label: 'Group Anagrams'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/monotonic-stack/739-daily-temperatures.mdx b/apps/docs/content/(01-linear-structures)/monotonic-stack/739-daily-temperatures.mdx
index 4ab179e..7dd5670 100644
--- a/apps/docs/content/(01-linear-structures)/monotonic-stack/739-daily-temperatures.mdx
+++ b/apps/docs/content/(01-linear-structures)/monotonic-stack/739-daily-temperatures.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Stack", slug: "stack" }
   - { name: "Monotonic Stack", slug: "monotonic-stack" }
 video: "cTBiBSnjO3c"
+issue: "https://github.com/prdlk/leetcode/issues/72"
 sidebar:
   label: 'Daily Temperatures'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/monotonic-stack/853-car-fleet.mdx b/apps/docs/content/(01-linear-structures)/monotonic-stack/853-car-fleet.mdx
index cede4bf..596b9a5 100644
--- a/apps/docs/content/(01-linear-structures)/monotonic-stack/853-car-fleet.mdx
+++ b/apps/docs/content/(01-linear-structures)/monotonic-stack/853-car-fleet.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Sorting", slug: "sorting" }
   - { name: "Monotonic Stack", slug: "monotonic-stack" }
 video: "Pr6T-3yB9RM"
+issue: "https://github.com/prdlk/leetcode/issues/73"
 sidebar:
   label: 'Car Fleet'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/prefix-sum/238-product-of-array-except-self.mdx b/apps/docs/content/(01-linear-structures)/prefix-sum/238-product-of-array-except-self.mdx
index 2057f2b..af5e828 100644
--- a/apps/docs/content/(01-linear-structures)/prefix-sum/238-product-of-array-except-self.mdx
+++ b/apps/docs/content/(01-linear-structures)/prefix-sum/238-product-of-array-except-self.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Prefix Sum", slug: "prefix-sum" }
 video: "bNvIQI2wAjk"
+issue: "https://github.com/prdlk/leetcode/issues/37"
 sidebar:
   label: 'Product of Array Except Self'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/prefix-sum/303-range-sum-query-immutable.mdx b/apps/docs/content/(01-linear-structures)/prefix-sum/303-range-sum-query-immutable.mdx
index 27e5de6..03f223c 100644
--- a/apps/docs/content/(01-linear-structures)/prefix-sum/303-range-sum-query-immutable.mdx
+++ b/apps/docs/content/(01-linear-structures)/prefix-sum/303-range-sum-query-immutable.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Design", slug: "design" }
   - { name: "Prefix Sum", slug: "prefix-sum" }
 video: "2pndAmo_sMA"
+issue: "https://github.com/prdlk/leetcode/issues/36"
 sidebar:
   label: 'Range Sum Query - Immutable'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/prefix-sum/560-subarray-sum-equals-k.mdx b/apps/docs/content/(01-linear-structures)/prefix-sum/560-subarray-sum-equals-k.mdx
index 28ffbad..4e2c017 100644
--- a/apps/docs/content/(01-linear-structures)/prefix-sum/560-subarray-sum-equals-k.mdx
+++ b/apps/docs/content/(01-linear-structures)/prefix-sum/560-subarray-sum-equals-k.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Hash Table", slug: "hash-table" }
   - { name: "Prefix Sum", slug: "prefix-sum" }
 video: "fFVZt-6sgyo"
+issue: "https://github.com/prdlk/leetcode/issues/38"
 sidebar:
   label: 'Subarray Sum Equals K'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/sliding-window/121-best-time-to-buy-and-sell-stock.mdx b/apps/docs/content/(01-linear-structures)/sliding-window/121-best-time-to-buy-and-sell-stock.mdx
index f16a23e..6d359e5 100644
--- a/apps/docs/content/(01-linear-structures)/sliding-window/121-best-time-to-buy-and-sell-stock.mdx
+++ b/apps/docs/content/(01-linear-structures)/sliding-window/121-best-time-to-buy-and-sell-stock.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
 video: "1pkOgXD63yU"
+issue: "https://github.com/prdlk/leetcode/issues/50"
 sidebar:
   label: 'Best Time to Buy and Sell Stock'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/sliding-window/3-longest-substring-without-repeating-characters.mdx b/apps/docs/content/(01-linear-structures)/sliding-window/3-longest-substring-without-repeating-characters.mdx
index 868cb8b..4c50c41 100644
--- a/apps/docs/content/(01-linear-structures)/sliding-window/3-longest-substring-without-repeating-characters.mdx
+++ b/apps/docs/content/(01-linear-structures)/sliding-window/3-longest-substring-without-repeating-characters.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Sliding Window", slug: "sliding-window" }
 video: "wiGpQwVHdE0"
+issue: "https://github.com/prdlk/leetcode/issues/51"
 sidebar:
   label: 'Longest Substring Without Repeating Characters'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/sliding-window/424-longest-repeating-character-replacement.mdx b/apps/docs/content/(01-linear-structures)/sliding-window/424-longest-repeating-character-replacement.mdx
index b4edf7a..49d055c 100644
--- a/apps/docs/content/(01-linear-structures)/sliding-window/424-longest-repeating-character-replacement.mdx
+++ b/apps/docs/content/(01-linear-structures)/sliding-window/424-longest-repeating-character-replacement.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Sliding Window", slug: "sliding-window" }
 video: "gqXU1UyA8pk"
+issue: "https://github.com/prdlk/leetcode/issues/52"
 sidebar:
   label: 'Longest Repeating Character Replacement'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/sliding-window/567-permutation-in-string.mdx b/apps/docs/content/(01-linear-structures)/sliding-window/567-permutation-in-string.mdx
index 5f8d189..e5271fc 100644
--- a/apps/docs/content/(01-linear-structures)/sliding-window/567-permutation-in-string.mdx
+++ b/apps/docs/content/(01-linear-structures)/sliding-window/567-permutation-in-string.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Sliding Window", slug: "sliding-window" }
 video: "UbyhOgBN834"
+issue: "https://github.com/prdlk/leetcode/issues/53"
 sidebar:
   label: 'Permutation in String'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/stack/150-evaluate-reverse-polish-notation.mdx b/apps/docs/content/(01-linear-structures)/stack/150-evaluate-reverse-polish-notation.mdx
index 6b18883..4efc5c2 100644
--- a/apps/docs/content/(01-linear-structures)/stack/150-evaluate-reverse-polish-notation.mdx
+++ b/apps/docs/content/(01-linear-structures)/stack/150-evaluate-reverse-polish-notation.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Math", slug: "math" }
   - { name: "Stack", slug: "stack" }
 video: "iu0082c4HDE"
+issue: "https://github.com/prdlk/leetcode/issues/69"
 sidebar:
   label: 'Evaluate Reverse Polish Notation'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/stack/155-min-stack.mdx b/apps/docs/content/(01-linear-structures)/stack/155-min-stack.mdx
index 36481f2..16781d0 100644
--- a/apps/docs/content/(01-linear-structures)/stack/155-min-stack.mdx
+++ b/apps/docs/content/(01-linear-structures)/stack/155-min-stack.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Stack", slug: "stack" }
   - { name: "Design", slug: "design" }
 video: "qkLl7nAwDPo"
+issue: "https://github.com/prdlk/leetcode/issues/68"
 sidebar:
   label: 'Min Stack'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/stack/20-valid-parentheses.mdx b/apps/docs/content/(01-linear-structures)/stack/20-valid-parentheses.mdx
index fa7c1b5..8119a36 100644
--- a/apps/docs/content/(01-linear-structures)/stack/20-valid-parentheses.mdx
+++ b/apps/docs/content/(01-linear-structures)/stack/20-valid-parentheses.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Stack", slug: "stack" }
   - { name: "Bracket Sequences", slug: "bracket-sequences" }
 video: "WTzjTskDFMg"
+issue: "https://github.com/prdlk/leetcode/issues/67"
 sidebar:
   label: 'Valid Parentheses'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/11-container-with-most-water.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/11-container-with-most-water.mdx
index a8facd9..c3c7b73 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/11-container-with-most-water.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/11-container-with-most-water.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "Greedy", slug: "greedy" }
 video: "UuiTKBwPgAo"
+issue: "https://github.com/prdlk/leetcode/issues/44"
 sidebar:
   label: 'Container With Most Water'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/125-valid-palindrome.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/125-valid-palindrome.mdx
index f02632c..9c57972 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/125-valid-palindrome.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/125-valid-palindrome.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "String", slug: "string" }
 video: "jJXJ16kPFWg"
+issue: "https://github.com/prdlk/leetcode/issues/41"
 sidebar:
   label: 'Valid Palindrome'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/15-3sum.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/15-3sum.mdx
index c773807..8b76afd 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/15-3sum.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/15-3sum.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "Sorting", slug: "sorting" }
 video: "jzZsG8n2R9A"
+issue: "https://github.com/prdlk/leetcode/issues/43"
 sidebar:
   label: '3Sum'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/167-two-sum-ii-input-array-is-sorted.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/167-two-sum-ii-input-array-is-sorted.mdx
index 2f4e59a..aadccd2 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/167-two-sum-ii-input-array-is-sorted.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/167-two-sum-ii-input-array-is-sorted.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "Binary Search", slug: "binary-search" }
 video: "cQ1Oz4ckceM"
+issue: "https://github.com/prdlk/leetcode/issues/42"
 sidebar:
   label: 'Two Sum II - Input Array Is Sorted'
   badge: 'Medium'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/392-is-subsequence.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/392-is-subsequence.mdx
index 7fab620..1127717 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/392-is-subsequence.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/392-is-subsequence.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
 video: "99RVfqklbCE"
+issue: "https://github.com/prdlk/leetcode/issues/45"
 sidebar:
   label: 'Is Subsequence'
   badge: 'Easy'
diff --git a/apps/docs/content/(01-linear-structures)/two-pointers/977-squares-of-a-sorted-array.mdx b/apps/docs/content/(01-linear-structures)/two-pointers/977-squares-of-a-sorted-array.mdx
index efbdc02..a2bde27 100644
--- a/apps/docs/content/(01-linear-structures)/two-pointers/977-squares-of-a-sorted-array.mdx
+++ b/apps/docs/content/(01-linear-structures)/two-pointers/977-squares-of-a-sorted-array.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "Sorting", slug: "sorting" }
 video: "FPCZsG_AkUg"
+issue: "https://github.com/prdlk/leetcode/issues/46"
 sidebar:
   label: 'Squares of a Sorted Array'
   badge: 'Easy'
diff --git a/apps/docs/content/(02-nodal-grid)/hybrid-structures/146-lru-cache.mdx b/apps/docs/content/(02-nodal-grid)/hybrid-structures/146-lru-cache.mdx
index e2cfa0a..06de793 100644
--- a/apps/docs/content/(02-nodal-grid)/hybrid-structures/146-lru-cache.mdx
+++ b/apps/docs/content/(02-nodal-grid)/hybrid-structures/146-lru-cache.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Design", slug: "design" }
   - { name: "Doubly-Linked List", slug: "doubly-linked-list" }
 video: "7ABFKPK2hD4"
+issue: "https://github.com/prdlk/leetcode/issues/87"
 sidebar:
   label: 'LRU Cache'
   badge: 'Medium'
diff --git a/apps/docs/content/(02-nodal-grid)/hybrid-structures/2-add-two-numbers.mdx b/apps/docs/content/(02-nodal-grid)/hybrid-structures/2-add-two-numbers.mdx
index a922d1c..62837b6 100644
--- a/apps/docs/content/(02-nodal-grid)/hybrid-structures/2-add-two-numbers.mdx
+++ b/apps/docs/content/(02-nodal-grid)/hybrid-structures/2-add-two-numbers.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Math", slug: "math" }
   - { name: "Recursion", slug: "recursion" }
 video: "wgFPrzTjm7s"
+issue: "https://github.com/prdlk/leetcode/issues/88"
 sidebar:
   label: 'Add Two Numbers'
   badge: 'Medium'
diff --git a/apps/docs/content/(02-nodal-grid)/linked-list/141-linked-list-cycle.mdx b/apps/docs/content/(02-nodal-grid)/linked-list/141-linked-list-cycle.mdx
index dca2a6f..a0d73a5 100644
--- a/apps/docs/content/(02-nodal-grid)/linked-list/141-linked-list-cycle.mdx
+++ b/apps/docs/content/(02-nodal-grid)/linked-list/141-linked-list-cycle.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Two Pointers", slug: "two-pointers" }
   - { name: "Floyd's Cycle Finding Algorithm", slug: "floyds-cycle-finding-algorithm" }
 video: "gBTe7lFR3vc"
+issue: "https://github.com/prdlk/leetcode/issues/79"
 sidebar:
   label: 'Linked List Cycle'
   badge: 'Easy'
diff --git a/apps/docs/content/(02-nodal-grid)/linked-list/206-reverse-linked-list.mdx b/apps/docs/content/(02-nodal-grid)/linked-list/206-reverse-linked-list.mdx
index f665b12..7a86f6a 100644
--- a/apps/docs/content/(02-nodal-grid)/linked-list/206-reverse-linked-list.mdx
+++ b/apps/docs/content/(02-nodal-grid)/linked-list/206-reverse-linked-list.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Linked List", slug: "linked-list" }
   - { name: "Recursion", slug: "recursion" }
 video: "G0_I-ZF0S38"
+issue: "https://github.com/prdlk/leetcode/issues/77"
 sidebar:
   label: 'Reverse Linked List'
   badge: 'Easy'
diff --git a/apps/docs/content/(02-nodal-grid)/linked-list/21-merge-two-sorted-lists.mdx b/apps/docs/content/(02-nodal-grid)/linked-list/21-merge-two-sorted-lists.mdx
index 650e88c..089d412 100644
--- a/apps/docs/content/(02-nodal-grid)/linked-list/21-merge-two-sorted-lists.mdx
+++ b/apps/docs/content/(02-nodal-grid)/linked-list/21-merge-two-sorted-lists.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Linked List", slug: "linked-list" }
   - { name: "Recursion", slug: "recursion" }
 video: "XIdigk956u0"
+issue: "https://github.com/prdlk/leetcode/issues/78"
 sidebar:
   label: 'Merge Two Sorted Lists'
   badge: 'Easy'
diff --git a/apps/docs/content/(02-nodal-grid)/matrix-index-math/48-rotate-image.mdx b/apps/docs/content/(02-nodal-grid)/matrix-index-math/48-rotate-image.mdx
index cd6d057..f414b6b 100644
--- a/apps/docs/content/(02-nodal-grid)/matrix-index-math/48-rotate-image.mdx
+++ b/apps/docs/content/(02-nodal-grid)/matrix-index-math/48-rotate-image.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Math", slug: "math" }
   - { name: "Matrix", slug: "matrix" }
 video: "fMSJSS7eO1w"
+issue: "https://github.com/prdlk/leetcode/issues/91"
 sidebar:
   label: 'Rotate Image'
   badge: 'Medium'
diff --git a/apps/docs/content/(02-nodal-grid)/matrix-index-math/54-spiral-matrix.mdx b/apps/docs/content/(02-nodal-grid)/matrix-index-math/54-spiral-matrix.mdx
index e1d400b..97b3921 100644
--- a/apps/docs/content/(02-nodal-grid)/matrix-index-math/54-spiral-matrix.mdx
+++ b/apps/docs/content/(02-nodal-grid)/matrix-index-math/54-spiral-matrix.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Matrix", slug: "matrix" }
   - { name: "Simulation", slug: "simulation" }
 video: "BJnMZNwUk1M"
+issue: "https://github.com/prdlk/leetcode/issues/92"
 sidebar:
   label: 'Spiral Matrix'
   badge: 'Medium'
diff --git a/apps/docs/content/(02-nodal-grid)/matrix-index-math/73-set-matrix-zeroes.mdx b/apps/docs/content/(02-nodal-grid)/matrix-index-math/73-set-matrix-zeroes.mdx
index 8520e8e..ee22440 100644
--- a/apps/docs/content/(02-nodal-grid)/matrix-index-math/73-set-matrix-zeroes.mdx
+++ b/apps/docs/content/(02-nodal-grid)/matrix-index-math/73-set-matrix-zeroes.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Hash Table", slug: "hash-table" }
   - { name: "Matrix", slug: "matrix" }
 video: "T41rL0L3Pnw"
+issue: "https://github.com/prdlk/leetcode/issues/93"
 sidebar:
   label: 'Set Matrix Zeroes'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/binary-search-tree/230-kth-smallest-element-in-a-bst.mdx b/apps/docs/content/(03-hierarchical)/binary-search-tree/230-kth-smallest-element-in-a-bst.mdx
index 6a6dbad..2c1481e 100644
--- a/apps/docs/content/(03-hierarchical)/binary-search-tree/230-kth-smallest-element-in-a-bst.mdx
+++ b/apps/docs/content/(03-hierarchical)/binary-search-tree/230-kth-smallest-element-in-a-bst.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Binary Search Tree", slug: "binary-search-tree" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "5LUXSvjmGCw"
+issue: "https://github.com/prdlk/leetcode/issues/112"
 sidebar:
   label: 'Kth Smallest Element in a BST'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/binary-search-tree/235-lowest-common-ancestor-of-a-binary-search-tree.mdx b/apps/docs/content/(03-hierarchical)/binary-search-tree/235-lowest-common-ancestor-of-a-binary-search-tree.mdx
index 88e60f3..7a78c59 100644
--- a/apps/docs/content/(03-hierarchical)/binary-search-tree/235-lowest-common-ancestor-of-a-binary-search-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/binary-search-tree/235-lowest-common-ancestor-of-a-binary-search-tree.mdx
@@ -10,6 +10,7 @@ topics:
   - { name: "Binary Lifting", slug: "binary-lifting" }
   - { name: "Lowest Common Ancestor", slug: "lowest-common-ancestor" }
 video: "gs2LMfuOR9k"
+issue: "https://github.com/prdlk/leetcode/issues/113"
 sidebar:
   label: 'Lowest Common Ancestor of a Binary Search Tree'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/binary-search-tree/98-validate-binary-search-tree.mdx b/apps/docs/content/(03-hierarchical)/binary-search-tree/98-validate-binary-search-tree.mdx
index 964de7e..84c14c7 100644
--- a/apps/docs/content/(03-hierarchical)/binary-search-tree/98-validate-binary-search-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/binary-search-tree/98-validate-binary-search-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Binary Search Tree", slug: "binary-search-tree" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "s6ATEkipzow"
+issue: "https://github.com/prdlk/leetcode/issues/111"
 sidebar:
   label: 'Validate Binary Search Tree'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/heap-priority-queue/215-kth-largest-element-in-an-array.mdx b/apps/docs/content/(03-hierarchical)/heap-priority-queue/215-kth-largest-element-in-an-array.mdx
index 0a14ddf..9c52705 100644
--- a/apps/docs/content/(03-hierarchical)/heap-priority-queue/215-kth-largest-element-in-an-array.mdx
+++ b/apps/docs/content/(03-hierarchical)/heap-priority-queue/215-kth-largest-element-in-an-array.mdx
@@ -9,6 +9,7 @@ topics:
   - { name: "Heap (Priority Queue)", slug: "heap-priority-queue" }
   - { name: "Quickselect", slug: "quickselect" }
 video: "XEmy13g1Qxc"
+issue: "https://github.com/prdlk/leetcode/issues/118"
 sidebar:
   label: 'Kth Largest Element in an Array'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/heap-priority-queue/23-merge-k-sorted-lists.mdx b/apps/docs/content/(03-hierarchical)/heap-priority-queue/23-merge-k-sorted-lists.mdx
index b5ac036..8cbeb85 100644
--- a/apps/docs/content/(03-hierarchical)/heap-priority-queue/23-merge-k-sorted-lists.mdx
+++ b/apps/docs/content/(03-hierarchical)/heap-priority-queue/23-merge-k-sorted-lists.mdx
@@ -9,6 +9,7 @@ topics:
   - { name: "Merge Sort", slug: "merge-sort" }
   - { name: "Tournament Sort", slug: "tournament-sort" }
 video: "q5a5OiGbT6Q"
+issue: "https://github.com/prdlk/leetcode/issues/120"
 sidebar:
   label: 'Merge k Sorted Lists'
   badge: 'Hard'
diff --git a/apps/docs/content/(03-hierarchical)/heap-priority-queue/973-k-closest-points-to-origin.mdx b/apps/docs/content/(03-hierarchical)/heap-priority-queue/973-k-closest-points-to-origin.mdx
index 0291cd7..401f18d 100644
--- a/apps/docs/content/(03-hierarchical)/heap-priority-queue/973-k-closest-points-to-origin.mdx
+++ b/apps/docs/content/(03-hierarchical)/heap-priority-queue/973-k-closest-points-to-origin.mdx
@@ -12,6 +12,7 @@ topics:
   - { name: "Quickselect", slug: "quickselect" }
   - { name: "K-D Tree", slug: "k-d-tree" }
 video: "rI2EBUEMfTk"
+issue: "https://github.com/prdlk/leetcode/issues/119"
 sidebar:
   label: 'K Closest Points to Origin'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/tree-bfs/102-binary-tree-level-order-traversal.mdx b/apps/docs/content/(03-hierarchical)/tree-bfs/102-binary-tree-level-order-traversal.mdx
index 89b2ffc..283919d 100644
--- a/apps/docs/content/(03-hierarchical)/tree-bfs/102-binary-tree-level-order-traversal.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-bfs/102-binary-tree-level-order-traversal.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "6ZnyEApgFYg"
+issue: "https://github.com/prdlk/leetcode/issues/106"
 sidebar:
   label: 'Binary Tree Level Order Traversal'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/tree-bfs/1448-count-good-nodes-in-binary-tree.mdx b/apps/docs/content/(03-hierarchical)/tree-bfs/1448-count-good-nodes-in-binary-tree.mdx
index a4e5c6a..e1ca428 100644
--- a/apps/docs/content/(03-hierarchical)/tree-bfs/1448-count-good-nodes-in-binary-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-bfs/1448-count-good-nodes-in-binary-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "7cp5imvDzl4"
+issue: "https://github.com/prdlk/leetcode/issues/108"
 sidebar:
   label: 'Count Good Nodes in Binary Tree'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/tree-bfs/199-binary-tree-right-side-view.mdx b/apps/docs/content/(03-hierarchical)/tree-bfs/199-binary-tree-right-side-view.mdx
index 68bdac9..f71c9aa 100644
--- a/apps/docs/content/(03-hierarchical)/tree-bfs/199-binary-tree-right-side-view.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-bfs/199-binary-tree-right-side-view.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "d4zLyf32e3I"
+issue: "https://github.com/prdlk/leetcode/issues/107"
 sidebar:
   label: 'Binary Tree Right Side View'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/tree-dfs/104-maximum-depth-of-binary-tree.mdx b/apps/docs/content/(03-hierarchical)/tree-dfs/104-maximum-depth-of-binary-tree.mdx
index 7833856..44086bc 100644
--- a/apps/docs/content/(03-hierarchical)/tree-dfs/104-maximum-depth-of-binary-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-dfs/104-maximum-depth-of-binary-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "hTM3phVI6YQ"
+issue: "https://github.com/prdlk/leetcode/issues/97"
 sidebar:
   label: 'Maximum Depth of Binary Tree'
   badge: 'Easy'
diff --git a/apps/docs/content/(03-hierarchical)/tree-dfs/226-invert-binary-tree.mdx b/apps/docs/content/(03-hierarchical)/tree-dfs/226-invert-binary-tree.mdx
index 986b39e..9ba052b 100644
--- a/apps/docs/content/(03-hierarchical)/tree-dfs/226-invert-binary-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-dfs/226-invert-binary-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Binary Tree", slug: "binary-tree" }
 video: "OnSn2XEQ4MY"
+issue: "https://github.com/prdlk/leetcode/issues/96"
 sidebar:
   label: 'Invert Binary Tree'
   badge: 'Easy'
diff --git a/apps/docs/content/(03-hierarchical)/tree-dfs/236-lowest-common-ancestor-of-a-binary-tree.mdx b/apps/docs/content/(03-hierarchical)/tree-dfs/236-lowest-common-ancestor-of-a-binary-tree.mdx
index b2aca2e..c160b8b 100644
--- a/apps/docs/content/(03-hierarchical)/tree-dfs/236-lowest-common-ancestor-of-a-binary-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/tree-dfs/236-lowest-common-ancestor-of-a-binary-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Binary Tree", slug: "binary-tree" }
   - { name: "Binary Lifting", slug: "binary-lifting" }
   - { name: "Lowest Common Ancestor", slug: "lowest-common-ancestor" }
+issue: "https://github.com/prdlk/leetcode/issues/98"
 sidebar:
   label: 'Lowest Common Ancestor of a Binary Tree'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/trie/208-implement-trie-prefix-tree.mdx b/apps/docs/content/(03-hierarchical)/trie/208-implement-trie-prefix-tree.mdx
index fe0d305..015aa09 100644
--- a/apps/docs/content/(03-hierarchical)/trie/208-implement-trie-prefix-tree.mdx
+++ b/apps/docs/content/(03-hierarchical)/trie/208-implement-trie-prefix-tree.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Design", slug: "design" }
   - { name: "Trie", slug: "trie" }
 video: "oobqoCJlHA0"
+issue: "https://github.com/prdlk/leetcode/issues/127"
 sidebar:
   label: 'Implement Trie (Prefix Tree)'
   badge: 'Medium'
diff --git a/apps/docs/content/(03-hierarchical)/trie/211-design-add-and-search-words-data-structure.mdx b/apps/docs/content/(03-hierarchical)/trie/211-design-add-and-search-words-data-structure.mdx
index 6b5b036..ab5cb0a 100644
--- a/apps/docs/content/(03-hierarchical)/trie/211-design-add-and-search-words-data-structure.mdx
+++ b/apps/docs/content/(03-hierarchical)/trie/211-design-add-and-search-words-data-structure.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Design", slug: "design" }
   - { name: "Trie", slug: "trie" }
 video: "BTf05gs_8iU"
+issue: "https://github.com/prdlk/leetcode/issues/128"
 sidebar:
   label: 'Design Add and Search Words Data Structure'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/graph-bfs/127-word-ladder.mdx b/apps/docs/content/(04-relational)/graph-bfs/127-word-ladder.mdx
index 7e080c6..b0ee12e 100644
--- a/apps/docs/content/(04-relational)/graph-bfs/127-word-ladder.mdx
+++ b/apps/docs/content/(04-relational)/graph-bfs/127-word-ladder.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Bidirectional Search", slug: "bidirectional-search" }
+issue: "https://github.com/prdlk/leetcode/issues/138"
 sidebar:
   label: 'Word Ladder'
   badge: 'Hard'
diff --git a/apps/docs/content/(04-relational)/graph-bfs/994-rotting-oranges.mdx b/apps/docs/content/(04-relational)/graph-bfs/994-rotting-oranges.mdx
index 592fa37..d6ac80a 100644
--- a/apps/docs/content/(04-relational)/graph-bfs/994-rotting-oranges.mdx
+++ b/apps/docs/content/(04-relational)/graph-bfs/994-rotting-oranges.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Matrix", slug: "matrix" }
+issue: "https://github.com/prdlk/leetcode/issues/137"
 sidebar:
   label: 'Rotting Oranges'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/graph-dfs/133-clone-graph.mdx b/apps/docs/content/(04-relational)/graph-dfs/133-clone-graph.mdx
index 7fb5d5e..b02427a 100644
--- a/apps/docs/content/(04-relational)/graph-dfs/133-clone-graph.mdx
+++ b/apps/docs/content/(04-relational)/graph-dfs/133-clone-graph.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Depth-First Search", slug: "depth-first-search" }
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Graph Theory", slug: "graph" }
+issue: "https://github.com/prdlk/leetcode/issues/131"
 sidebar:
   label: 'Clone Graph'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/graph-dfs/200-number-of-islands.mdx b/apps/docs/content/(04-relational)/graph-dfs/200-number-of-islands.mdx
index cdf70f9..6d3c78e 100644
--- a/apps/docs/content/(04-relational)/graph-dfs/200-number-of-islands.mdx
+++ b/apps/docs/content/(04-relational)/graph-dfs/200-number-of-islands.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Union-Find", slug: "union-find" }
   - { name: "Matrix", slug: "matrix" }
+issue: "https://github.com/prdlk/leetcode/issues/130"
 sidebar:
   label: 'Number of Islands'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/graph-dfs/417-pacific-atlantic-water-flow.mdx b/apps/docs/content/(04-relational)/graph-dfs/417-pacific-atlantic-water-flow.mdx
index 1eff7a6..3c28408 100644
--- a/apps/docs/content/(04-relational)/graph-dfs/417-pacific-atlantic-water-flow.mdx
+++ b/apps/docs/content/(04-relational)/graph-dfs/417-pacific-atlantic-water-flow.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Depth-First Search", slug: "depth-first-search" }
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Matrix", slug: "matrix" }
+issue: "https://github.com/prdlk/leetcode/issues/132"
 sidebar:
   label: 'Pacific Atlantic Water Flow'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/topological-sort/207-course-schedule.mdx b/apps/docs/content/(04-relational)/topological-sort/207-course-schedule.mdx
index 5b8b902..b122cb2 100644
--- a/apps/docs/content/(04-relational)/topological-sort/207-course-schedule.mdx
+++ b/apps/docs/content/(04-relational)/topological-sort/207-course-schedule.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Graph Theory", slug: "graph" }
   - { name: "Topological Sort", slug: "topological-sort" }
   - { name: "Directed Acyclic Graph", slug: "directed-acyclic-graph" }
+issue: "https://github.com/prdlk/leetcode/issues/142"
 sidebar:
   label: 'Course Schedule'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/topological-sort/210-course-schedule-ii.mdx b/apps/docs/content/(04-relational)/topological-sort/210-course-schedule-ii.mdx
index 7dec059..21d2900 100644
--- a/apps/docs/content/(04-relational)/topological-sort/210-course-schedule-ii.mdx
+++ b/apps/docs/content/(04-relational)/topological-sort/210-course-schedule-ii.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Graph Theory", slug: "graph" }
   - { name: "Topological Sort", slug: "topological-sort" }
+issue: "https://github.com/prdlk/leetcode/issues/143"
 sidebar:
   label: 'Course Schedule II'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/union-find/323-number-of-connected-components-in-an-undirected-graph.mdx b/apps/docs/content/(04-relational)/union-find/323-number-of-connected-components-in-an-undirected-graph.mdx
index 2222441..30617c7 100644
--- a/apps/docs/content/(04-relational)/union-find/323-number-of-connected-components-in-an-undirected-graph.mdx
+++ b/apps/docs/content/(04-relational)/union-find/323-number-of-connected-components-in-an-undirected-graph.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Union-Find", slug: "union-find" }
   - { name: "Graph Theory", slug: "graph" }
+issue: "https://github.com/prdlk/leetcode/issues/147"
 sidebar:
   label: 'Number of Connected Components in an Undirected Graph'
   badge: 'Medium'
diff --git a/apps/docs/content/(04-relational)/union-find/684-redundant-connection.mdx b/apps/docs/content/(04-relational)/union-find/684-redundant-connection.mdx
index a488d90..18a44f8 100644
--- a/apps/docs/content/(04-relational)/union-find/684-redundant-connection.mdx
+++ b/apps/docs/content/(04-relational)/union-find/684-redundant-connection.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Union-Find", slug: "union-find" }
   - { name: "Graph Theory", slug: "graph" }
+issue: "https://github.com/prdlk/leetcode/issues/146"
 sidebar:
   label: 'Redundant Connection'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/198-house-robber.mdx b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/198-house-robber.mdx
index e437faf..26564e0 100644
--- a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/198-house-robber.mdx
+++ b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/198-house-robber.mdx
@@ -5,6 +5,7 @@ icon: dot
 topics:
   - { name: "Array", slug: "array" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
+issue: "https://github.com/prdlk/leetcode/issues/158"
 sidebar:
   label: 'House Robber'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/322-coin-change.mdx b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/322-coin-change.mdx
index e69b165..ccd7358 100644
--- a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/322-coin-change.mdx
+++ b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/322-coin-change.mdx
@@ -8,6 +8,7 @@ topics:
   - { name: "Breadth-First Search", slug: "breadth-first-search" }
   - { name: "Knapsack Problem", slug: "knapsack-problem" }
   - { name: "Complete Knapsack", slug: "complete-knapsack" }
+issue: "https://github.com/prdlk/leetcode/issues/159"
 sidebar:
   label: 'Coin Change'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/70-climbing-stairs.mdx b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/70-climbing-stairs.mdx
index 9a13baf..a81d727 100644
--- a/apps/docs/content/(05-decision-space)/1d-dynamic-programming/70-climbing-stairs.mdx
+++ b/apps/docs/content/(05-decision-space)/1d-dynamic-programming/70-climbing-stairs.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Math", slug: "math" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Memoization", slug: "memoization" }
+issue: "https://github.com/prdlk/leetcode/issues/157"
 sidebar:
   label: 'Climbing Stairs'
   badge: 'Easy'
diff --git a/apps/docs/content/(05-decision-space)/backtracking/39-combination-sum.mdx b/apps/docs/content/(05-decision-space)/backtracking/39-combination-sum.mdx
index 9012c47..cfbe231 100644
--- a/apps/docs/content/(05-decision-space)/backtracking/39-combination-sum.mdx
+++ b/apps/docs/content/(05-decision-space)/backtracking/39-combination-sum.mdx
@@ -5,6 +5,7 @@ icon: dot
 topics:
   - { name: "Array", slug: "array" }
   - { name: "Backtracking", slug: "backtracking" }
+issue: "https://github.com/prdlk/leetcode/issues/150"
 sidebar:
   label: 'Combination Sum'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/backtracking/46-permutations.mdx b/apps/docs/content/(05-decision-space)/backtracking/46-permutations.mdx
index 60dd7bf..abaad93 100644
--- a/apps/docs/content/(05-decision-space)/backtracking/46-permutations.mdx
+++ b/apps/docs/content/(05-decision-space)/backtracking/46-permutations.mdx
@@ -5,6 +5,7 @@ icon: dot
 topics:
   - { name: "Array", slug: "array" }
   - { name: "Backtracking", slug: "backtracking" }
+issue: "https://github.com/prdlk/leetcode/issues/151"
 sidebar:
   label: 'Permutations'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/backtracking/78-subsets.mdx b/apps/docs/content/(05-decision-space)/backtracking/78-subsets.mdx
index 55d6ae1..4527e92 100644
--- a/apps/docs/content/(05-decision-space)/backtracking/78-subsets.mdx
+++ b/apps/docs/content/(05-decision-space)/backtracking/78-subsets.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Backtracking", slug: "backtracking" }
   - { name: "Bit Manipulation", slug: "bit-manipulation" }
+issue: "https://github.com/prdlk/leetcode/issues/149"
 sidebar:
   label: 'Subsets'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/greedy/134-gas-station.mdx b/apps/docs/content/(05-decision-space)/greedy/134-gas-station.mdx
index 364a2b7..4901b13 100644
--- a/apps/docs/content/(05-decision-space)/greedy/134-gas-station.mdx
+++ b/apps/docs/content/(05-decision-space)/greedy/134-gas-station.mdx
@@ -5,6 +5,7 @@ icon: dot
 topics:
   - { name: "Array", slug: "array" }
   - { name: "Greedy", slug: "greedy" }
+issue: "https://github.com/prdlk/leetcode/issues/176"
 sidebar:
   label: 'Gas Station'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/greedy/53-maximum-subarray.mdx b/apps/docs/content/(05-decision-space)/greedy/53-maximum-subarray.mdx
index 098bc44..e5c73b2 100644
--- a/apps/docs/content/(05-decision-space)/greedy/53-maximum-subarray.mdx
+++ b/apps/docs/content/(05-decision-space)/greedy/53-maximum-subarray.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Divide and Conquer", slug: "divide-and-conquer" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
+issue: "https://github.com/prdlk/leetcode/issues/174"
 sidebar:
   label: 'Maximum Subarray'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/greedy/55-jump-game.mdx b/apps/docs/content/(05-decision-space)/greedy/55-jump-game.mdx
index 1ac6acd..5540d4b 100644
--- a/apps/docs/content/(05-decision-space)/greedy/55-jump-game.mdx
+++ b/apps/docs/content/(05-decision-space)/greedy/55-jump-game.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Greedy", slug: "greedy" }
+issue: "https://github.com/prdlk/leetcode/issues/175"
 sidebar:
   label: 'Jump Game'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/intervals/435-non-overlapping-intervals.mdx b/apps/docs/content/(05-decision-space)/intervals/435-non-overlapping-intervals.mdx
index 63c89ed..37fa35b 100644
--- a/apps/docs/content/(05-decision-space)/intervals/435-non-overlapping-intervals.mdx
+++ b/apps/docs/content/(05-decision-space)/intervals/435-non-overlapping-intervals.mdx
@@ -7,6 +7,7 @@ topics:
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Greedy", slug: "greedy" }
   - { name: "Sorting", slug: "sorting" }
+issue: "https://github.com/prdlk/leetcode/issues/183"
 sidebar:
   label: 'Non-overlapping Intervals'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/intervals/56-merge-intervals.mdx b/apps/docs/content/(05-decision-space)/intervals/56-merge-intervals.mdx
index e0cf768..04ddab1 100644
--- a/apps/docs/content/(05-decision-space)/intervals/56-merge-intervals.mdx
+++ b/apps/docs/content/(05-decision-space)/intervals/56-merge-intervals.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Sorting", slug: "sorting" }
   - { name: "Quicksort", slug: "quicksort" }
+issue: "https://github.com/prdlk/leetcode/issues/182"
 sidebar:
   label: 'Merge Intervals'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/intervals/57-insert-interval.mdx b/apps/docs/content/(05-decision-space)/intervals/57-insert-interval.mdx
index 90291c2..a9bc1c2 100644
--- a/apps/docs/content/(05-decision-space)/intervals/57-insert-interval.mdx
+++ b/apps/docs/content/(05-decision-space)/intervals/57-insert-interval.mdx
@@ -4,6 +4,7 @@ description: You are given an array of non-overlapping intervals intervals where
 icon: dot
 topics:
   - { name: "Array", slug: "array" }
+issue: "https://github.com/prdlk/leetcode/issues/181"
 sidebar:
   label: 'Insert Interval'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/1143-longest-common-subsequence.mdx b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/1143-longest-common-subsequence.mdx
index d1c4461..433fb71 100644
--- a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/1143-longest-common-subsequence.mdx
+++ b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/1143-longest-common-subsequence.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "String", slug: "string" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Longest Common Subsequence", slug: "longest-common-subsequence" }
+issue: "https://github.com/prdlk/leetcode/issues/168"
 sidebar:
   label: 'Longest Common Subsequence'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/62-unique-paths.mdx b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/62-unique-paths.mdx
index 4d0b730..1e460a9 100644
--- a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/62-unique-paths.mdx
+++ b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/62-unique-paths.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Math", slug: "math" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Combinatorics", slug: "combinatorics" }
+issue: "https://github.com/prdlk/leetcode/issues/166"
 sidebar:
   label: 'Unique Paths'
   badge: 'Medium'
diff --git a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/64-minimum-path-sum.mdx b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/64-minimum-path-sum.mdx
index 5c98023..32e455a 100644
--- a/apps/docs/content/(05-decision-space)/multi-d-grid-dp/64-minimum-path-sum.mdx
+++ b/apps/docs/content/(05-decision-space)/multi-d-grid-dp/64-minimum-path-sum.mdx
@@ -6,6 +6,7 @@ topics:
   - { name: "Array", slug: "array" }
   - { name: "Dynamic Programming", slug: "dynamic-programming" }
   - { name: "Matrix", slug: "matrix" }
+issue: "https://github.com/prdlk/leetcode/issues/167"
 sidebar:
   label: 'Minimum Path Sum'
   badge: 'Medium'
diff --git a/apps/docs/content/guides/(1-data-structures)/array.mdx b/apps/docs/content/appendix/(1-data-structures)/array.mdx
similarity index 100%
rename from apps/docs/content/guides/(1-data-structures)/array.mdx
rename to apps/docs/content/appendix/(1-data-structures)/array.mdx
diff --git a/apps/docs/content/guides/(1-data-structures)/binary-tree.mdx b/apps/docs/content/appendix/(1-data-structures)/binary-tree.mdx
similarity index 100%
rename from apps/docs/content/guides/(1-data-structures)/binary-tree.mdx
rename to apps/docs/content/appendix/(1-data-structures)/binary-tree.mdx
diff --git a/apps/docs/content/guides/(1-data-structures)/directed-acyclic-graph.mdx b/apps/docs/content/appendix/(1-data-structures)/directed-acyclic-graph.mdx
similarity index 100%
rename from apps/docs/content/guides/(1-data-structures)/directed-acyclic-graph.mdx
rename to apps/docs/content/appendix/(1-data-structures)/directed-acyclic-graph.mdx
diff --git a/apps/docs/content/guides/(1-data-structures)/doubly-linked-list.mdx b/apps/docs/content/appendix/(1-data-structures)/doubly-linked-list.mdx
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rename from apps/docs/content/guides/(1-data-structures)/doubly-linked-list.mdx
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diff --git a/apps/docs/content/guides/(1-data-structures)/graph.mdx b/apps/docs/content/appendix/(1-data-structures)/graph.mdx
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rename to apps/docs/content/appendix/(1-data-structures)/graph.mdx
diff --git a/apps/docs/content/guides/(1-data-structures)/k-d-tree.mdx b/apps/docs/content/appendix/(1-data-structures)/k-d-tree.mdx
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rename to apps/docs/content/appendix/(1-data-structures)/k-d-tree.mdx
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diff --git a/apps/docs/content/guides/(1-data-structures)/string.mdx b/apps/docs/content/appendix/(1-data-structures)/string.mdx
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diff --git a/apps/docs/content/guides/(1-data-structures)/tree.mdx b/apps/docs/content/appendix/(1-data-structures)/tree.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/bidirectional-search.mdx b/apps/docs/content/appendix/(2-algorithms)/bidirectional-search.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/binary-lifting.mdx b/apps/docs/content/appendix/(2-algorithms)/binary-lifting.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/bit-manipulation.mdx b/apps/docs/content/appendix/(2-algorithms)/bit-manipulation.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/bracket-sequences.mdx b/apps/docs/content/appendix/(2-algorithms)/bracket-sequences.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/bucket-sort.mdx b/apps/docs/content/appendix/(2-algorithms)/bucket-sort.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/complete-knapsack.mdx b/apps/docs/content/appendix/(2-algorithms)/complete-knapsack.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/divide-and-conquer.mdx b/apps/docs/content/appendix/(2-algorithms)/divide-and-conquer.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/floyds-cycle-finding-algorithm.mdx b/apps/docs/content/appendix/(2-algorithms)/floyds-cycle-finding-algorithm.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/knapsack-problem.mdx b/apps/docs/content/appendix/(2-algorithms)/knapsack-problem.mdx
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rename to apps/docs/content/appendix/(2-algorithms)/knapsack-problem.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/lowest-common-ancestor.mdx b/apps/docs/content/appendix/(2-algorithms)/lowest-common-ancestor.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/memoization.mdx b/apps/docs/content/appendix/(2-algorithms)/memoization.mdx
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rename to apps/docs/content/appendix/(2-algorithms)/memoization.mdx
diff --git a/apps/docs/content/guides/(2-algorithms)/merge-sort.mdx b/apps/docs/content/appendix/(2-algorithms)/merge-sort.mdx
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rename from apps/docs/content/guides/(2-algorithms)/merge-sort.mdx
rename to apps/docs/content/appendix/(2-algorithms)/merge-sort.mdx
diff --git a/apps/docs/content/guides/(2-algorithms)/meta.ts b/apps/docs/content/appendix/(2-algorithms)/meta.ts
similarity index 100%
rename from apps/docs/content/guides/(2-algorithms)/meta.ts
rename to apps/docs/content/appendix/(2-algorithms)/meta.ts
diff --git a/apps/docs/content/guides/(2-algorithms)/quickselect.mdx b/apps/docs/content/appendix/(2-algorithms)/quickselect.mdx
similarity index 100%
rename from apps/docs/content/guides/(2-algorithms)/quickselect.mdx
rename to apps/docs/content/appendix/(2-algorithms)/quickselect.mdx
diff --git a/apps/docs/content/guides/quicksort.mdx b/apps/docs/content/appendix/(2-algorithms)/quicksort.mdx
similarity index 93%
rename from apps/docs/content/guides/quicksort.mdx
rename to apps/docs/content/appendix/(2-algorithms)/quicksort.mdx
index 212fe75..ebfaf68 100644
--- a/apps/docs/content/guides/quicksort.mdx
+++ b/apps/docs/content/appendix/(2-algorithms)/quicksort.mdx
@@ -1,5 +1,6 @@
 ---
 title: "Quicksort"
+icon: shuffle
 list: "https://leetcode.com/problem-list/quicksort/"
 sidebar:
   badge: '1'
diff --git a/apps/docs/content/guides/(2-algorithms)/recursion.mdx b/apps/docs/content/appendix/(2-algorithms)/recursion.mdx
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rename from apps/docs/content/guides/(2-algorithms)/recursion.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/simulation.mdx b/apps/docs/content/appendix/(2-algorithms)/simulation.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/sorting.mdx b/apps/docs/content/appendix/(2-algorithms)/sorting.mdx
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diff --git a/apps/docs/content/guides/(2-algorithms)/tournament-sort.mdx b/apps/docs/content/appendix/(2-algorithms)/tournament-sort.mdx
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diff --git a/apps/docs/content/guides/(3-techniques)/combinatorics.mdx b/apps/docs/content/appendix/(3-techniques)/combinatorics.mdx
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diff --git a/apps/docs/content/guides/(3-techniques)/counting.mdx b/apps/docs/content/appendix/(3-techniques)/counting.mdx
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diff --git a/apps/docs/content/guides/(3-techniques)/design.mdx b/apps/docs/content/appendix/(3-techniques)/design.mdx
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diff --git a/apps/docs/content/guides/(3-techniques)/geometry.mdx b/apps/docs/content/appendix/(3-techniques)/geometry.mdx
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rename from apps/docs/content/guides/(3-techniques)/geometry.mdx
rename to apps/docs/content/appendix/(3-techniques)/geometry.mdx
diff --git a/apps/docs/content/guides/(3-techniques)/math.mdx b/apps/docs/content/appendix/(3-techniques)/math.mdx
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rename from apps/docs/content/guides/(3-techniques)/math.mdx
rename to apps/docs/content/appendix/(3-techniques)/math.mdx
diff --git a/apps/docs/content/guides/(3-techniques)/meta.ts b/apps/docs/content/appendix/(3-techniques)/meta.ts
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rename from apps/docs/content/guides/(3-techniques)/meta.ts
rename to apps/docs/content/appendix/(3-techniques)/meta.ts
diff --git a/apps/docs/content/appendix/meta.ts b/apps/docs/content/appendix/meta.ts
new file mode 100644
index 0000000..227695e
--- /dev/null
+++ b/apps/docs/content/appendix/meta.ts
@@ -0,0 +1,3 @@
+import { defineMeta } from "blume";
+
+export default defineMeta({ title: "Appendix", icon: "library", order: 0, display: "page" });
diff --git a/apps/docs/content/guides/meta.ts b/apps/docs/content/guides/meta.ts
deleted file mode 100644
index bc56e7b..0000000
--- a/apps/docs/content/guides/meta.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-import { defineMeta } from "blume";
-
-export default defineMeta({ title: "Guides" });
diff --git a/apps/docs/content/todo.md b/apps/docs/content/todo.md
deleted file mode 100644
index 1deff09..0000000
--- a/apps/docs/content/todo.md
+++ /dev/null
@@ -1,181 +0,0 @@
----
-hidden: true
----
-
-# todo — draining the review backlog
-
-every solution in `work/1` owes a blind re-solve at `work/3` and a second one at `work/7`. both buckets are empty, so 36 problems owe 72 re-solves and not one has been started. snapshot: `reviewqueues("2026-08-31")` from `apps/cli/work.ts` — what `bun run pick` shows — cross-checked against `/api/stats`.
-
-at 10 problems a day *including* the campaign's own load, 72 re-solves do not fit in one week: this week absorbs 38, the `+3` rung finishes **sat sep 5** (campaign day 20), the last `+7` clears **fri sep 18** (day 33), and normal srs resumes **sat sep 19** — see [when standard srs resumes](#when-standard-srs-resumes). saturday gates are deliberately left out of the count.
-
-## rules this plan follows
-
-- **≤ 10 problems a day, everything counted.** each day's new core set and the on-time reviews it earns are booked first; the backlog takes what is left — 7 slots on a light day, 2 on a heavy one.
-- **coverage before depth.** all 36 `+3` re-solves come first — one blind pass over everything — before any problem gets its `+7`.
-- **oldest first.** lc 387 and lc 1365 have been sitting 50 days.
-- **≥ 3 days between a problem's own `+3` and `+7`.** two re-solves in one day test nothing.
-- **sunday is not a slot.** `workingday()` never mints one; neither does this list.
-- **re-solve blind, then push.** `bun run pick` (tab cycles to the 3-day and 7-day sections) scaffolds straight into `work/3`/`work/7`. do not open `work/1` first. pushing the file is the log: `close-solved.yml` posts the bucket to `/admin/solved` and d1 moves the problem up the ladder.
-
-## this week
-
-### mon aug 31 — 3 new + 7 backlog = 10/10
-
-*topic 08 — linked list ([#10](https://github.com/prdlk/leetcode/issues/10), closed today)*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/1` | [lc 21 · merge two sorted lists](https://github.com/prdlk/leetcode/issues/78) | easy | linked list | done today |
-| `work/1` | [lc 206 · reverse linked list](https://github.com/prdlk/leetcode/issues/77) | easy | linked list | done today |
-| `work/1` | [lc 141 · linked list cycle](https://github.com/prdlk/leetcode/issues/79) | easy | hash table | done today |
-| `work/3` | lc 387 · first unique character in a string | easy | hash table | 50d stale — first solved 2026-07-12 |
-| `work/3` | lc 1365 · how many numbers are smaller than the current number | easy | array | 50d stale — first solved 2026-07-12 |
-| `work/3` | lc 268 · missing number | easy | array | 14d stale — first solved 2026-08-17 |
-| `work/3` | lc 344 · reverse string | easy | two pointers | 14d stale — first solved 2026-08-17 |
-| `work/3` | lc 1426 · counting elements | easy | array | 14d stale — first solved 2026-08-17 |
-| `work/3` | lc 1832 · check if the sentence is pangram | easy | hash table | 14d stale — first solved 2026-08-17 |
-| `work/3` | [lc 15 · 3sum](https://github.com/prdlk/leetcode/issues/43) | medium | array | 13d stale — first solved 2026-08-18 |
-
-### tue sep 1 — 2 new + 8 backlog = 10/10
-
-*topic 09 — hybrid structures ([#11](https://github.com/prdlk/leetcode/issues/11))*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/1` | [lc 146 · lru cache](https://github.com/prdlk/leetcode/issues/87) | medium | topic 09 — hybrid structures | new core problem |
-| `work/1` | [lc 2 · add two numbers](https://github.com/prdlk/leetcode/issues/88) | medium | topic 09 — hybrid structures | new core problem |
-| `work/3` | [lc 49 · group anagrams](https://github.com/prdlk/leetcode/issues/30) | medium | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 125 · valid palindrome](https://github.com/prdlk/leetcode/issues/41) | easy | two pointers | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 167 · two sum ii - input array is sorted](https://github.com/prdlk/leetcode/issues/42) | medium | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 217 · contains duplicate](https://github.com/prdlk/leetcode/issues/27) | easy | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 238 · product of array except self](https://github.com/prdlk/leetcode/issues/37) | medium | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 242 · valid anagram](https://github.com/prdlk/leetcode/issues/28) | easy | hash table | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 303 · range sum query - immutable](https://github.com/prdlk/leetcode/issues/36) | easy | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 560 · subarray sum equals k](https://github.com/prdlk/leetcode/issues/38) | medium | array | 13d stale — first solved 2026-08-18 |
-
-### wed sep 2 — 3 new + 7 backlog = 10/10
-
-*topic 10 — matrix index math ([#12](https://github.com/prdlk/leetcode/issues/12))*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/1` | [lc 48 · rotate image](https://github.com/prdlk/leetcode/issues/91) | medium | topic 10 — matrix index math | new core problem |
-| `work/1` | [lc 54 · spiral matrix](https://github.com/prdlk/leetcode/issues/92) | medium | topic 10 — matrix index math | new core problem |
-| `work/1` | [lc 73 · set matrix zeroes](https://github.com/prdlk/leetcode/issues/93) | medium | topic 10 — matrix index math | new core problem |
-| `work/3` | lc 1413 · minimum value to get positive step by step sum | easy | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | lc 1480 · running sum of 1d array | easy | array | 13d stale — first solved 2026-08-18 |
-| `work/3` | [lc 33 · search in rotated sorted array](https://github.com/prdlk/leetcode/issues/60) | medium | array | 12d stale — first solved 2026-08-19 |
-| `work/3` | [lc 704 · binary search](https://github.com/prdlk/leetcode/issues/58) | easy | array | 12d stale — first solved 2026-08-19 |
-| `work/3` | [lc 875 · koko eating bananas](https://github.com/prdlk/leetcode/issues/59) | medium | array | 12d stale — first solved 2026-08-19 |
-| `work/3` | [lc 977 · squares of a sorted array](https://github.com/prdlk/leetcode/issues/46) | easy | array | 12d stale — first solved 2026-08-19 |
-| `work/3` | [lc 121 · best time to buy and sell stock](https://github.com/prdlk/leetcode/issues/50) | easy | array | 11d stale — first solved 2026-08-20 |
-
-### thu sep 3 — 3 new + 3 on-time reviews + 4 backlog = 10/10
-
-*topic 11 — tree dfs ([#13](https://github.com/prdlk/leetcode/issues/13))*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/1` | [lc 226 · invert binary tree](https://github.com/prdlk/leetcode/issues/96) | easy | topic 11 — tree dfs | new core problem |
-| `work/1` | [lc 104 · maximum depth of binary tree](https://github.com/prdlk/leetcode/issues/97) | easy | topic 11 — tree dfs | new core problem |
-| `work/1` | [lc 236 · lowest common ancestor of a binary tree](https://github.com/prdlk/leetcode/issues/98) | medium | topic 11 — tree dfs | new core problem |
-| `work/3` | [lc 21 · merge two sorted lists](https://github.com/prdlk/leetcode/issues/78) | easy | linked list | on time — solved mon aug 31 |
-| `work/3` | [lc 206 · reverse linked list](https://github.com/prdlk/leetcode/issues/77) | easy | linked list | on time — solved mon aug 31 |
-| `work/3` | [lc 141 · linked list cycle](https://github.com/prdlk/leetcode/issues/79) | easy | hash table | on time — solved mon aug 31 |
-| `work/3` | [lc 1 · two sum](https://github.com/prdlk/leetcode/issues/29) | easy | array | 7d stale — first solved 2026-08-24 |
-| `work/3` | [lc 11 · container with most water](https://github.com/prdlk/leetcode/issues/44) | medium | array | 7d stale — first solved 2026-08-24 |
-| `work/3` | [lc 392 · is subsequence](https://github.com/prdlk/leetcode/issues/45) | easy | two pointers | 7d stale — first solved 2026-08-24 |
-| `work/3` | [lc 3 · longest substring without repeating characters](https://github.com/prdlk/leetcode/issues/51) | medium | hash table | 6d stale — first solved 2026-08-25 |
-
-### fri sep 4 — 3 new + 2 on-time reviews + 5 backlog = 10/10
-
-*topic 12 — tree bfs ([#14](https://github.com/prdlk/leetcode/issues/14))*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/1` | [lc 102 · binary tree level order traversal](https://github.com/prdlk/leetcode/issues/106) | medium | topic 12 — tree bfs | new core problem |
-| `work/1` | [lc 199 · binary tree right side view](https://github.com/prdlk/leetcode/issues/107) | medium | topic 12 — tree bfs | new core problem |
-| `work/1` | [lc 1448 · count good nodes in binary tree](https://github.com/prdlk/leetcode/issues/108) | medium | topic 12 — tree bfs | new core problem |
-| `work/3` | [lc 146 · lru cache](https://github.com/prdlk/leetcode/issues/87) | medium | topic 09 — hybrid structures | on time — solved tue sep 1 |
-| `work/3` | [lc 2 · add two numbers](https://github.com/prdlk/leetcode/issues/88) | medium | topic 09 — hybrid structures | on time — solved tue sep 1 |
-| `work/3` | [lc 424 · longest repeating character replacement](https://github.com/prdlk/leetcode/issues/52) | medium | hash table | 6d stale — first solved 2026-08-25 |
-| `work/3` | [lc 567 · permutation in string](https://github.com/prdlk/leetcode/issues/53) | medium | hash table | 6d stale — first solved 2026-08-25 |
-| `work/3` | [lc 35 · search insert position](https://github.com/prdlk/leetcode/issues/63) | easy | array | 5d stale — first solved 2026-08-26 |
-| `work/3` | [lc 74 · search a 2d matrix](https://github.com/prdlk/leetcode/issues/61) | medium | array | 5d stale — first solved 2026-08-26 |
-| `work/3` | [lc 153 · find minimum in rotated sorted array](https://github.com/prdlk/leetcode/issues/62) | medium | array | 5d stale — first solved 2026-08-26 |
-
-### sat sep 5 — 3 on-time reviews + 7 backlog = 10/10
-
-*no new topic — saturday.*
-
-| bucket | problem | difficulty | where | why |
-| --- | --- | --- | --- | --- |
-| `work/3` | [lc 48 · rotate image](https://github.com/prdlk/leetcode/issues/91) | medium | topic 10 — matrix index math | on time — solved wed sep 2 |
-| `work/3` | [lc 54 · spiral matrix](https://github.com/prdlk/leetcode/issues/92) | medium | topic 10 — matrix index math | on time — solved wed sep 2 |
-| `work/3` | [lc 73 · set matrix zeroes](https://github.com/prdlk/leetcode/issues/93) | medium | topic 10 — matrix index math | on time — solved wed sep 2 |
-| `work/3` | [lc 20 · valid parentheses](https://github.com/prdlk/leetcode/issues/67) | easy | string | 4d stale — first solved 2026-08-27 |
-| `work/3` | [lc 150 · evaluate reverse polish notation](https://github.com/prdlk/leetcode/issues/69) | medium | array | 4d stale — first solved 2026-08-27 |
-| `work/3` | [lc 155 · min stack](https://github.com/prdlk/leetcode/issues/68) | medium | stack | 4d stale — first solved 2026-08-27 |
-| `work/3` | [lc 739 · daily temperatures](https://github.com/prdlk/leetcode/issues/72) | medium | array | 3d stale — first solved 2026-08-28 |
-| `work/3` | [lc 853 · car fleet](https://github.com/prdlk/leetcode/issues/73) | medium | array | 3d stale — first solved 2026-08-28 |
-| `work/7` | lc 387 · first unique character in a string | easy | hash table | `+3` was mon aug 31 |
-| `work/7` | lc 1365 · how many numbers are smaller than the current number | easy | array | `+3` was mon aug 31 |
-
-### sun sep 6 — rest day
-
-nothing. by design.
-
-## carry-over
-
-the 34 re-solves that do not fit this week, at the same cap and the same rules. booked = that day's new core set plus the on-time reviews it owes.
-
-| day | topic | booked | backlog re-solves | load |
-| --- | --- | --- | --- | --- |
-| **mon sep 7** | topic 13 — binary search tree | 10 | *none — the day is already full* | 10/10 |
-| **tue sep 8** | topic 14 — heap / priority queue | 7 | `work/7` — lc 268, lc 344, lc 1426 | 10/10 |
-| **wed sep 9** | topic 15 — trie | 5 | `work/7` — lc 1832, lc 15, lc 49, lc 125, lc 167 | 10/10 |
-| **thu sep 10** | topic 16 — graph dfs | 9 | `work/7` — lc 217 | 10/10 |
-| **fri sep 11** | topic 17 — graph bfs | 8 | `work/7` — lc 238, lc 242 | 10/10 |
-| **sat sep 12** | *none — saturday* | 2 | `work/7` — lc 303, lc 560, lc 1413, lc 1480, lc 33, lc 704, lc 875, lc 977 | 10/10 |
-| **mon sep 14** | topic 18 — topological sort | 10 | *none — the day is already full* | 10/10 |
-| **tue sep 15** | topic 19 — union-find | 5 | `work/7` — lc 121, lc 1, lc 11, lc 392, lc 3 | 10/10 |
-| **wed sep 16** | topic 20 — backtracking | 5 | `work/7` — lc 424, lc 567, lc 35, lc 74, lc 153 | 10/10 |
-| **thu sep 17** | topic 21 — 1-d dynamic programming | 8 | `work/7` — lc 20, lc 150 | 10/10 |
-| **fri sep 18** | topic 22 — multi-d / grid dp | 7 | `work/7` — lc 155, lc 739, lc 853 | 10/10 |
-
-## when standard srs resumes
-
-- **sat sep 5** (campaign day 20) — the `+3` rung is empty. every one of the 36 has been recalled blind once; nothing is unretrieved any more.
-- **fri sep 18** (campaign day 33) — the last backlog `+7` lands. `work/3` and `work/7` hold a file for all 36, so `reviewqueues()` owes nothing; the 28 that have a d1 row are `retired` on the ladder, and the 8 listed at the bottom of this file never had one.
-- **sat sep 19 onward — standard srs.** the only reviews left are the ones the campaign itself minted: solve a problem, its `+3` and `+7` come back on `workingday(solve + 3)` and `workingday(solve + 7)`, the digest asks for ≤ `review_cap` (3) a day, `levelreviews()` pushes any excess forward, and `bun run pick`'s 3-day and 7-day sections show only what is due. no dated plan needed after this — the digest *is* the plan.
-
-campaign-native load per working day once the backlog is gone, all of it inside the cap:
-
-| day | topic | new | `work/3` | `work/7` | load |
-| --- | --- | --- | --- | --- | --- |
-| **sat sep 19** | *review-only* | 0 | 3 | 0 | 3/10 |
-| **mon sep 21** | topic 23 — greedy | 3 | 5 | 2 | 10/10 |
-| **tue sep 22** | topic 24 — intervals | 3 | 1 | 2 | 6/10 |
-| **wed sep 23** | *review-only* | 0 | 0 | 3 | 3/10 |
-| **thu sep 24** | *review-only* | 0 | 3 | 3 | 6/10 |
-| **fri sep 25** | *review-only* | 0 | 3 | 3 | 6/10 |
-| **sat sep 26** | *review-only* | 0 | 0 | 0 | 0/10 |
-| **mon sep 28** | *review-only* | 0 | 0 | 3 | 3/10 |
-| **tue sep 29** | *review-only* | 0 | 0 | 3 | 3/10 |
-
-two things to watch there. **mon sep 21 is 10/10 on campaign load alone** — topic 23's core set, two `+7`s, and five of the six `+3`s that land there (thursday's three slide off sunday onto monday, friday's three land natively, and the sixth is pushed to tuesday exactly as `levelreviews()` would) — so one slipped day re-opens a backlog. and from **wed sep 30** the ladder runs dry: `apps/api/data/schedule.json` books its last topic tue sep 22, so the review-only weeks that close the campaign are drills, optional sets and the weekly gates, none of which this file counts.
-
-## not reviews
-
-three july scaffolds in `work/1` are still empty, so they owe no re-solve — they are unsolved problems, and `bun run pick` still lists them in its new-problem section:
-
-| problem | difficulty |
-| --- | --- |
-| [lc 347 · top k frequent elements](https://github.com/prdlk/leetcode/issues/31) | medium |
-| lc 451 · sort characters by frequency | medium |
-| lc 1636 · sort array by increasing frequency | easy |
-
-## what this plan exposes
-
-- **8 of the 36 have no problem issue** (387, 1365, 268, 344, 1426, 1832, 1413, 1480) — pre-campaign solves. the catalog reconcile never invents rows, so d1 does not know them and no digest can ever surface them. `bun run pick` is the only thing that will ask for these reviews.
-- **`/api/stats` reports a stage that does not exist**: `ladder: { new: 128, "+3": 3, "+7": 0, retired: 0, "+2": 30 }`. `+2` is not in `stages` (`apps/api/src/srs.ts`), so 30 rows sit on a pre-`0002` rung — which is why the digest queue plateaus at 32 due instead of tracking the tables above. that wants a migration, not a re-solve.