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Campaign

_{8-week interview-prep fight camp. Each phase is a milestone; each topic an issue; each problem a sub-issue. Core count reflects closed sub-issues.}

Phase	Wk	Date	Topic	Core	Core problems
I _{Linear Structures}	1	Mon Aug 17	01 · Hash-Based Lookup	5/5	217 · 242 · 1 · 49 · 347
	1	Tue Aug 18	02 · Prefix Sum	3/3	303 · 238 · 560
	2	Mon Aug 24	03 · Two Pointers	2/4	125 · 167 · 15 · 11
	2	Tue Aug 25	04 · Sliding Window	1/4	121 · 3 · 424 · 567
	2	Wed Aug 26	05 · Binary Search	3/5	704 · 875 · 33 · 74 · 153
	2	Thu Aug 27	06 · Stack	0/3	20 · 155 · 150
	2	Fri Aug 28	07 · Monotonic Stack	0/2	739 · 853
II _{Nodal & Grid}	3	Mon Aug 31	08 · Linked List	0/3	206 · 21 · 141
	3	Tue Sep 1	09 · Hybrid Structures	0/2	146 · 2
	3	Wed Sep 2	10 · Matrix Index Math	0/3	48 · 54 · 73
III _Hierarchical	3	Thu Sep 3	11 · Tree DFS	0/3	226 · 104 · 236
	3	Fri Sep 4	12 · Tree BFS	0/3	102 · 199 · 1448
	4	Mon Sep 7	13 · Binary Search Tree	0/3	98 · 230 · 235
	4	Tue Sep 8	14 · Heap / Priority Queue	0/3	215 · 973 · 23
	4	Wed Sep 9	15 · Trie	0/2	208 · 211
IV _Relational	4	Thu Sep 10	16 · Graph DFS	0/3	200 · 133 · 417
	4	Fri Sep 11	17 · Graph BFS	0/2	994 · 127
	5	Mon Sep 14	18 · Topological Sort	0/2	207 · 210
	5	Tue Sep 15	19 · Union-Find	0/2	684 · 323
V _{Decision Space}	5	Wed Sep 16	20 · Backtracking	0/3	78 · 39 · 46
	5	Thu Sep 17	21 · 1-D Dynamic Programming	0/3	70 · 198 · 322
	5	Fri Sep 18	22 · Multi-D / Grid DP	0/3	62 · 64 · 1143
	6	Mon Sep 21	23 · Greedy	0/3	53 · 55 · 134
	6	Tue Sep 22	24 · Intervals	0/3	57 · 56 · 435

Phase I — Linear Structures (Week 1)

Topic	Set	LC #	Problem
1. Hash-Based Lookup _{builds on nothing}	`A`	217	Contains Duplicate
	`A`	242	Valid Anagram
	`A`	1	Two Sum
	`A`	49	Group Anagrams
	`A`	347	Top K Frequent Elements
	`B`	383	Ransom Note
	`B`	205	Isomorphic Strings
	`B`	128	Longest Consecutive Sequence
	`B`	290	Word Pattern
2. Prefix Sum _{builds on 1}	`A`	303	Range Sum Query
	`A`	238	Product of Array Except Self
	`A`	560	Subarray Sum Equals K
	`B`	525	Contiguous Array
	`B`	974	Subarray Sums Divisible by K
3. Two Pointers _{builds on ordered iteration}	`A`	125	Valid Palindrome
	`A`	167	Two Sum II
	`A`	15	3Sum
	`A`	11	Container With Most Water
	`A`	42	Trapping Rain Water
	`B`	392	Is Subsequence
	`B`	977	Squares of a Sorted Array
	`B`	189	Rotate Array
	`B`	80	Remove Duplicates II
4. Sliding Window _{builds on 3}	`A`	121	Best Time to Buy and Sell Stock
	`A`	3	Longest Substring Without Repeating Characters
	`A`	424	Longest Repeating Character Replacement
	`A`	567	Permutation in String
	`A`	76	Minimum Window Substring
	`B`	209	Minimum Size Subarray Sum
	`B`	1004	Max Consecutive Ones III
	`B`	643	Maximum Average Subarray
5. Binary Search _{builds on ordered / monotonic invariants}	`A`	704	Binary Search
	`A`	74	Search a 2D Matrix
	`A`	875	Koko Eating Bananas
	`A`	33	Search in Rotated Sorted Array
	`A`	153	Find Minimum in Rotated Sorted Array
	`B`	35	Search Insert Position
	`B`	162	Find Peak Element
	`B`	34	First & Last Position
	`B` ⭐	4	Median of Two Sorted Arrays
6. Stack _{independent primitive}	`A`	20	Valid Parentheses
	`A`	155	Min Stack
	`A`	150	Evaluate Reverse Polish Notation
	`B`	71	Simplify Path
	`B` ⭐	224	Basic Calculator
7. Monotonic Stack _{builds on 6}	`A`	739	Daily Temperatures
	`A`	853	Car Fleet
	`B`	496	Next Greater Element I
	`B`	901	Online Stock Span
	`B` ⭐	84	Largest Rectangle in Histogram

---

Phase II — Nodal & Grid Structures (Week 2)

Topic	Set	LC #	Problem
8. Linked List _{independent primitive}	`A`	206	Reverse Linked List
	`A`	21	Merge Two Sorted Lists
	`A`	141	Linked List Cycle
	`A`	19	Remove Nth Node From End
	`A`	143	Reorder List
	`B`	876	Middle of the Linked List
	`B`	92	Reverse Linked List II
	`B`	82	Remove Duplicates from Sorted List II
	`B`	61	Rotate List
	`B`	86	Partition List
9. Hybrid Structures _{builds on 1 + 8}	`A`	146	LRU Cache
	`A`	2	Add Two Numbers
	`B`	138	Copy List with Random Pointer
	`B`	380	Insert Delete GetRandom O(1)
10. Matrix Index Math _{builds on 3 — NOT graph traversal}	`A`	48	Rotate Image
	`A`	54	Spiral Matrix
	`A`	73	Set Matrix Zeroes
	`B`	36	Valid Sudoku
	`B`	289	Game of Life

---

Phase III — Hierarchical Structures (Week 3)

Topic	Set	LC #	Problem
11. Tree DFS _{builds on recursion}	`A`	226	Invert Binary Tree
	`A`	104	Maximum Depth of Binary Tree
	`A`	100	Same Tree
	`A`	572	Subtree of Another Tree
	`A`	236	Lowest Common Ancestor
	`A` ⭐	124	Binary Tree Maximum Path Sum
	`B`	101	Symmetric Tree
	`B`	112	Path Sum
	`B`	129	Sum Root to Leaf Numbers
	`B`	543	Diameter of Binary Tree
12. Tree BFS _{builds on 6's sibling (queue) + 11}	`A`	102	Level Order Traversal
	`A`	199	Right Side View
	`A`	1448	Count Good Nodes
	`B`	103	Zigzag Level Order
	`B`	637	Average of Levels
13. Binary Search Tree _{builds on 5 + 11}	`A`	98	Validate BST
	`A`	230	Kth Smallest in BST
	`A`	235	LCA of BST
	`A`	105	Build from Preorder + Inorder
	`B`	530	Minimum Absolute Difference
	`B`	173	BST Iterator
	`B`	108	Sorted Array to BST
14. Heap / Priority Queue _{implicit tree over array}	`A`	215	Kth Largest in Array
	`A`	703	Kth Largest in Stream
	`A`	973	K Closest Points
	`A`	621	Task Scheduler
	`A`	23	Merge K Sorted Lists
	`B`	1046	Last Stone Weight
	`B`	373	K Pairs with Smallest Sums
	`B` ⭐	295	Find Median from Data Stream
	`B` ⭐	502	IPO
15. Trie _{builds on 11}	`A`	208	Implement Trie
	`A`	211	Add & Search Words
	`B`	212	Word Search II _{(needs topic 20 — schedule after)}

---

Phase IV — Relational Structures (Week 4)

Topic	Set	LC #	Problem
16. Graph DFS _{builds on 11 + visited set}	`A`	200	Number of Islands
	`A`	695	Max Area of Island
	`A`	133	Clone Graph
	`A`	417	Pacific Atlantic Water Flow
	`A`	130	Surrounded Regions
	`B`	399	Evaluate Division
	`B`	261	Graph Valid Tree
17. Graph BFS _{builds on 12 + visited set — shortest path unweighted}	`A`	994	Rotting Oranges
	`A`	127	Word Ladder
	`B`	909	Snakes and Ladders
	`B`	433	Minimum Genetic Mutation
	`B`	286	Walls and Gates
18. Topological Sort _{builds on 16}	`A`	207	Course Schedule
	`A`	210	Course Schedule II
	`B` ⭐	269	Alien Dictionary
	`B`	1462	Course Schedule IV
19. Union-Find _{builds on 16's problem class}	`A`	684	Redundant Connection
	`A`	323	Number of Connected Components
	`B`	128	Longest Consecutive (union-find variant)
	`B`	721	Accounts Merge

---

Phase V — Decision-Space Exploration (Weeks 4–5)

Topic	Set	LC #	Problem
20. Backtracking _{builds on 16 — then unlock LC 212 from topic 15}	`A`	78	Subsets
	`A`	39	Combination Sum
	`A`	46	Permutations
	`A`	79	Word Search
	`B`	17	Letter Combinations
	`B`	77	Combinations
	`B`	22	Generate Parentheses
	`B` ⭐	52	N-Queens II
21. 1-D Dynamic Programming _{builds on 20}	`A`	70	Climbing Stairs
	`A`	746	Min Cost Climbing Stairs
	`A`	198	House Robber
	`A`	213	House Robber II
	`A`	322	Coin Change
	`A`	300	Longest Increasing Subsequence
	`B`	139	Word Break
	`B`	91	Decode Ways
	`B`	647	Palindromic Substrings
22. Multi-D / Grid DP _{builds on 21}	`A`	62	Unique Paths
	`A`	64	Minimum Path Sum
	`A`	1143	Longest Common Subsequence
	`B`	120	Triangle
	`B`	63	Unique Paths II
	`B` ⭐	72	Edit Distance
	`B`	221	Maximal Square
	`B` ⭐	97	Interleaving String
23. Greedy _{builds on 21 — includes Kadane's}	`A`	53	Maximum Subarray
	`A`	55	Jump Game
	`A`	45	Jump Game II
	`A`	134	Gas Station
	`B`	122	Best Time to Buy and Sell Stock II
	`B`	918	Maximum Sum Circular Subarray
	`B`	763	Partition Labels
24. Intervals _{builds on 23}	`A`	57	Insert Interval
	`A`	56	Merge Intervals
	`A`	435	Non-Overlapping Intervals
	`A`	253	Meeting Rooms II
	`B`	228	Summary Ranges
	`B`	452	Minimum Arrows to Burst Balloons
	`B`	252	Meeting Rooms I

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