feat(work): add solutions for 150.evaluate-reverse-polish-notation and 155.min-stack, remove 42.trapping-rain-water

AGENTS.md

@@ -49,8 +49,10 @@ All from the repo root (a Bun workspace over `apps/*`):
 bun run pick            # scaffold a solution via leetcode-cli (fuzzy picker; hides problems
                         # already under work/, caches index+descriptions in
                         # ~/.local/share/leetcode/data.db — see apps/cli/db.ts)
-bun run test            # run ONE solution against LeetCode's judge (not a test suite)
+bun run test            # run ONE solution against LeetCode's judge (not a test suite;
-bun run submit          # submit ONE solution to LeetCode (same picker as test)
+                        # most recently tested first, stamped in the db on exit 0)
+bun run submit          # submit ONE solution to LeetCode (newest scaffold first, nothing
+                        # hidden; last_submitted stamped in the db on exit 0)
 bun run sync            # work/ → apps/docs/content/ pages
 bun run dev|build       # Blume docs site (runs in apps/docs/)
 bun run close-solved -- --dry-run    # issue reconcilers (also DRY_RUN=1)

apps/api/src/stats.ts

@@ -10,6 +10,7 @@ import {
   addDays,
   campaignDay,
   campaignWeek,
+  isoWeek,
   streak,
 } from "./srs.ts";
 
@@ -61,9 +62,14 @@ export async function buildStats(db: D1Database, today: string): Promise<object>
   const ladder: Record<string, number> = { new: 0, "+2": 0, "+5": 0, "+10": 0, retired: 0 };
   for (const row of ladderRows) ladder[row.stage] = row.n;
 
-  const { results: gates } = await db
+  // gates rows are keyed by ISO week (that's the digest/gate contract), but
+  // the page speaks campaign weeks. The campaign never crosses a year
+  // boundary, so a plain offset converts safely.
+  const isoWeekOffset = isoWeek(CAMPAIGN_START) - 1;
+  const { results: gateRows } = await db
     .prepare("SELECT week, issue, pass_rate, closed_on FROM gates ORDER BY week")
     .all<{ week: number; issue: number | null; pass_rate: number | null; closed_on: string | null }>();
+  const gates = gateRows.map((g) => ({ ...g, week: g.week - isoWeekOffset }));
 
   // Review-queue depth for the next 14 days: everything due by that day.
   const queue: { date: string; due: number }[] = [];

apps/cli/db.ts

@@ -10,6 +10,12 @@
  *     are ever fetched, and paid-only problems are skipped because GraphQL
  *     returns null content for them.
  *
+ * A `solutions` table tracks the lifecycle of each work/ file by LC number:
+ * `created_at` (backfilled from the file's birthtime on every picker run),
+ * `last_tested` and `last_submitted` (stamped on exit 0 of leetcode-cli).
+ * The test picker sorts by last_tested, the submit picker by created_at, and
+ * submit hides anything with a last_submitted.
+ *
  * Library: side-effect-free on import — nothing is opened or fetched until
  * problemDb() is called. Index upserts never touch the description column, so
  * a daily refresh cannot evict cached statements.
@@ -27,6 +33,13 @@ export interface Problem {
   paidOnly: boolean;
 }
 
+/** Lifecycle of one work/ solution, keyed by LC number. ISO timestamps. */
+export interface SolutionActivity {
+  createdAt: string;
+  lastTested: string | null;
+  lastSubmitted: string | null;
+}
+
 const DIFFICULTY = ["", "Easy", "Medium", "Hard"] as const;
 const INDEX_TTL_MS = 24 * 60 * 60 * 1000;
 
@@ -109,6 +122,13 @@ export function problemDb(path = DB_PATH) {
       paid_only   INTEGER NOT NULL,
       description TEXT
     );
+    CREATE TABLE IF NOT EXISTS solutions (
+      id             INTEGER PRIMARY KEY,
+      created_at     TEXT NOT NULL,
+      last_tested    TEXT,
+      last_submitted TEXT
+    );
+    DROP TABLE IF EXISTS submissions;
     CREATE TABLE IF NOT EXISTS meta (
       key   TEXT PRIMARY KEY,
       value TEXT NOT NULL
@@ -177,6 +197,37 @@ export function problemDb(path = DB_PATH) {
       db.query("UPDATE problems SET description = ?2 WHERE slug = ?1").run(slug, html);
     },
 
+    /** Per-solution lifecycle rows keyed by LC number. */
+    solutionActivity(): Map<number, SolutionActivity> {
+      const rows = db
+        .query<{ id: number; created_at: string; last_tested: string | null; last_submitted: string | null }, []>(
+          "SELECT id, created_at, last_tested, last_submitted FROM solutions",
+        )
+        .all();
+      return new Map(
+        rows.map((r) => [r.id, { createdAt: r.created_at, lastTested: r.last_tested, lastSubmitted: r.last_submitted }]),
+      );
+    },
+
+    /** Register a solution's creation time; existing rows are left alone. */
+    ensureSolution(id: number, createdAt: string): void {
+      db.query("INSERT INTO solutions (id, created_at) VALUES (?1, ?2) ON CONFLICT(id) DO NOTHING").run(id, createdAt);
+    },
+
+    markTested(id: number): void {
+      db.query(
+        `INSERT INTO solutions (id, created_at, last_tested) VALUES (?1, ?2, ?2)
+         ON CONFLICT(id) DO UPDATE SET last_tested = excluded.last_tested`,
+      ).run(id, new Date().toISOString());
+    },
+
+    markSubmitted(id: number): void {
+      db.query(
+        `INSERT INTO solutions (id, created_at, last_submitted) VALUES (?1, ?2, ?2)
+         ON CONFLICT(id) DO UPDATE SET last_submitted = excluded.last_submitted`,
+      ).run(id, new Date().toISOString());
+    },
+
     close(): void {
       db.close();
     },

apps/cli/solutions.ts

@@ -1,18 +1,64 @@
 /**
  * Shared work/ solution picker for the test and submit entries: fuzzy-select
- * a solution file, then hand it to leetcode-cli. Library: side-effect-free on
+ * a solution file, then hand it to leetcode-cli.
- * import — nothing scans the filesystem until runOnSolution() is called.
+ *
+ * Every run backfills the db's solutions table with created_at (from the
+ * file's birthtime, mtime when the filesystem has none) so ordering works for
+ * files that predate the db. Ordering is per command — test lists the most
+ * recently tested first (never-tested after, by name); submit lists the most
+ * recently created first. Nothing is ever hidden. Exit 0 of leetcode-cli
+ * stamps last_tested / last_submitted.
+ *
+ * Library: side-effect-free on import — nothing scans the filesystem until
+ * runOnSolution() is called.
  */
 import { autocomplete, cancel, isCancel, log } from "@clack/prompts";
-import { join, relative } from "node:path";
+import { statSync } from "node:fs";
+import { basename, join, relative } from "node:path";
+import { problemDb } from "./db";
 
 const ROOT = join(import.meta.dir, "..", "..");
 const WORK_DIR = join(ROOT, "work");
 
+/** Leading LC number of a work/ file, or undefined for unnumbered names. */
+function lcNumber(rel: string): number | undefined {
+  const m = basename(rel).match(/^(\d+)\./);
+  return m ? Number(m[1]) : undefined;
+}
+
 /** Fuzzy-pick a solution under work/ and run `leetcode <command>` on it. */
 export async function runOnSolution(command: "test" | "submit", message: string): Promise<never> {
-  const files = [...new Bun.Glob("**/*.{js,ts,py,java,c,cpp,go,rs,rb,swift,kt,cs}").scanSync({ cwd: WORK_DIR })]
+  const db = problemDb();
-    .sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));
+
+  const scanned = [...new Bun.Glob("**/*.{js,ts,py,java,c,cpp,go,rs,rb,swift,kt,cs}").scanSync({ cwd: WORK_DIR })];
+
+  // register creation times so files older than the db still sort correctly
+  for (const f of scanned) {
+    const num = lcNumber(f);
+    if (num === undefined) continue;
+    const stat = statSync(join(WORK_DIR, f));
+    db.ensureSolution(num, new Date(stat.birthtimeMs || stat.mtimeMs).toISOString());
+  }
+  const activity = db.solutionActivity();
+
+  // test → most recently tested first; submit → most recently created first
+  const sortKey = (f: string) => {
+    const num = lcNumber(f);
+    const row = num === undefined ? undefined : activity.get(num);
+    return (command === "test" ? row?.lastTested : row?.createdAt) ?? undefined;
+  };
+
+  const files = scanned
+    .sort((a, b) => {
+      const ka = sortKey(a);
+      const kb = sortKey(b);
+      if (ka !== kb) {
+        if (ka === undefined) return 1;
+        if (kb === undefined) return -1;
+        return kb.localeCompare(ka); // ISO timestamps: lexicographic = chronological
+      }
+      return a.localeCompare(b, undefined, { numeric: true });
+    });
 
   if (files.length === 0) {
     log.error(`No solution files found in ${relative(process.cwd(), WORK_DIR)}/`);
@@ -55,5 +101,12 @@ export async function runOnSolution(command: "test" | "submit", message: string)
     ],
     { cwd: ROOT, stdio: ["inherit", "inherit", "inherit"] },
   );
-  process.exit(await proc.exited);
+  const code = await proc.exited;
+  const num = lcNumber(picked);
+  if (code === 0 && num !== undefined) {
+    if (command === "test") db.markTested(num);
+    else db.markSubmitted(num);
+  }
+  db.close();
+  process.exit(code);
 }

apps/docs/content/(array)/150-evaluate-reverse-polish-notation.mdx

@@ -0,0 +1,55 @@
+---
+title: '150. Evaluate Reverse Polish Notation'
+description: You are given an array of strings tokens that represents an arithmetic expression in a Reverse Polish Notation
+sidebar:
+  label: 'Evaluate Reverse Polish Notation'
+  badge: 'Medium'
+---
+
+<Badge variant="accent">Stack</Badge>
+
+### Example 1:
+- Input: `tokens = ["2","1","+","3","*"]`
+- Output: `9`
+- Explanation: `((2 + 1`) * `3`) = `9`
+
+### Example 2:
+- Input: `tokens = ["4","13","5","/","+"]`
+- Output: `6`
+- Explanation: `(4 + (13 / 5`)) = `6`
+
+### Example 3:
+- Input: `tokens = ["10","6","9","3","+","-11","*","/","*","17","+","5","+"]`
+- Output: `22`
+- Explanation: `((10 * (6 / ((9 + 3`) * `-11`))) + `17`) + `5 = ((10 * (6 / (12 * -11`))) + `17`) + `5 = ((10 * (6 / -132`)) + `17`) + `5 = ((10 * 0`) + `17`) + `5 = (0 + 17`) + `5 = 17 + 5 = 22`
+
+### Constraints:
+
+- `1 <= tokens.length <= 10^4`
+- `tokens[i]` is either an operator: "+", "-", "*", or "/", or an integer in the range [-200, 200].
+
+## Solution
+
+```py
+class Solution:
+    def evalRPN(self, tokens: List[str]) -> int:
+        stack = []
+        operations = {
+            "+": lambda x, y: int(x + y),
+            "-": lambda x, y: int(x - y),
+            "*": lambda x, y: int(x * y),
+            "/": lambda x, y: int(x / y),
+        }
+
+        for c in tokens:
+            if c in operations:
+                y = stack.pop()
+                x = stack.pop()
+                calc_func = operations[c]
+                result = calc_func(x, y)
+                stack.append(result)
+            else:
+                stack.append(int(c))
+
+        return stack[0]
+```

apps/docs/content/(array)/153-find-minimum-in-rotated-sorted-array.mdx

@@ -0,0 +1,55 @@
+---
+title: '153. Find Minimum in Rotated Sorted Array'
+description: 'Suppose an array of length n sorted in ascending order is rotated between 1 and n times. For example, the array nums = [0,1,2,4,5,6,7] might become:'
+sidebar:
+  label: 'Find Minimum in Rotated Sorted Array'
+  badge: 'Medium'
+---
+
+<Badge variant="accent">Binary Search</Badge>
+
+::::warning
+Notice that rotating an array [a[0], a[1], a[2], ..., a[n-1]] 1 time results in the array [a[n-1], a[0], a[1], a[2], ..., a[n-2]].
+::::
+
+### Example 1:
+- Input: `nums = [3,4,5,1,2]`
+- Output: `1`
+- Explanation: The original array was `[1,2,3,4,5]` rotated `3` times.
+
+### Example 2:
+- Input: `nums = [4,5,6,7,0,1,2]`
+- Output: `0`
+- Explanation: The original array was `[0,1,2,4,5,6,7]` and it was rotated `4` times.
+
+### Example 3:
+- Input: `nums = [11,13,15,17]`
+- Output: `11`
+- Explanation: The original array was `[11,13,15,17]` and it was rotated `4` times.
+
+### Constraints:
+
+- `n == nums.length`
+- `1 <= n <= 5000`
+- `-5000 <= nums[i] <= 5000`
+- All the integers of `nums` are unique.
+- `nums` is sorted and rotated between 1 and `n` times.
+
+## Solution
+
+```py
+class Solution:
+    def findMin(self, nums: List[int]) -> int:
+        l, r = 0, len(nums) - 1
+        lowest_index = -1
+
+        while l <= r:
+            m = (l + r) // 2
+            if nums[m] <= nums[-1]:
+                lowest_index = m
+                r = m - 1
+            else:
+                l = m + 1
+
+        return nums[lowest_index]
+```

apps/docs/content/(array)/189-rotate-array.mdx

@@ -1,42 +0,0 @@
----
-title: '189. Rotate Array'
-description: Given an integer array nums, rotate the array to the right by k steps, where k is non-negative
-sidebar:
-  label: 'Rotate Array'
-  badge: 'Medium'
----
-
-<Badge variant="accent">Two Pointers</Badge>
-
-::::warning
-Try to come up with as many solutions as you can. There are at least three different ways to solve this problem. Could you do it in-place with `O(1)` extra space?
-::::
-
-### Example 1:
-- Input: `nums = [1,2,3,4,5,6,7], k = 3`
-- Output: `[5,6,7,1,2,3,4]`
-- Explanation: rotate 1 steps to the right: `[7,1,2,3,4,5,6]` rotate 2 steps to the right: `[6,7,1,2,3,4,5]` rotate 3 steps to the right: `[5,6,7,1,2,3,4]`
-
-### Example 2:
-- Input: `nums = [-1,-100,3,99], k = 2`
-- Output: `[3,99,-1,-100]`
-- Explanation: rotate 1 steps to the right: `[99,-1,-100,3]` rotate 2 steps to the right: `[3,99,-1,-100]`
-
-### Constraints:
-
-- `1 <= nums.length <= 10^5`
-- `-2^31 <= nums[i] <= 2^31 - 1`
-- `0 <= k <= 10^5`
-
-## Solution
-
-```js
-/**
- * @param {number[]} nums
- * @param {number} k
- * @return {void} Do not return anything, modify nums in-place instead.
- */
-var rotate = function(nums, k) {
-    
-};
-```

apps/docs/content/(array)/2090-k-radius-subarray-averages.mdx

@@ -1,50 +0,0 @@
----
-title: '2090. K Radius Subarray Averages'
-description: You are given a 0-indexed array nums of n integers, and an integer k
-sidebar:
-  label: 'K Radius Subarray Averages'
-  badge: 'Medium'
----
-
-<Badge variant="accent">Array</Badge>
-
-### Example 1:
-- Input: `nums = [7,4,3,9,1,8,5,2,6], k = 3`
-- Output: `[-1,-1,-1,5,4,4,-1,-1,-1]`
-- Explanation:
-  - `avg[0]`, `avg[1]`, and `avg[2]` are `-1` because there are less than `k` elements before each index.
-  - The sum of the subarray centered at index `3` with radius `3` is: `7 + 4 + 3 + 9 + 1 + 8 + 5 = 37`. Using integer division, `avg[3] = 37 / 7 = 5`.
-  - For the subarray centered at index `4`, `avg[4] = (4 + 3 + 9 + 1 + 8 + 5 + 2) / 7 = 4`.
-  - For the subarray centered at index `5`, `avg[5] = (3 + 9 + 1 + 8 + 5 + 2 + 6) / 7 = 4`.
-  - `avg[6]`, `avg[7]`, and `avg[8]` are `-1` because there are less than `k` elements after each index.
-
-### Example 2:
-- Input: `nums = [100000], k = 0`
-- Output: `[100000]`
-- Explanation:
-  - The sum of the subarray centered at index `0` with radius `0` is: `100000`. `avg[0] = 100000 / 1 = 100000`.
-
-### Example 3:
-- Input: `nums = [8], k = 100000`
-- Output: `[-1]`
-- Explanation:
-  - `avg[0]` is `-1` because there are less than `k` elements before and after index `0`.
-
-### Constraints:
-
-- `n == nums.length`
-- `1 <= n <= 10^5`
-- `0 <= nums[i], k <= 10^5`
-
-## Solution
-
-```js
-/**
- * @param {number[]} nums
- * @param {number} k
- * @return {number[]}
- */
-var getAverages = function(nums, k) {
-    
-};
-```

apps/docs/content/(array)/35-search-insert-position.mdx

@@ -0,0 +1,51 @@
+---
+title: '35. Search Insert Position'
+description: Given a sorted array of distinct integers and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order
+sidebar:
+  label: 'Search Insert Position'
+  badge: 'Easy'
+---
+
+<Badge variant="accent">Binary Search</Badge>
+
+::::warning
+You must write an algorithm with O(log n) runtime complexity.
+::::
+
+### Example 1:
+- Input: `nums = [1,3,5,6], target = 5`
+- Output: `2`
+
+### Example 2:
+- Input: `nums = [1,3,5,6], target = 2`
+- Output: `1`
+
+### Example 3:
+- Input: `nums = [1,3,5,6], target = 7`
+- Output: `4`
+
+### Constraints:
+
+- `1 <= nums.length <= 10^4`
+- `-10^4 <= nums[i] <= 10^4`
+- `nums` contains distinct values sorted in ascending order.
+- `-10^4 <= target <= 10^4`
+
+## Solution
+
+```py
+class Solution:
+    def searchInsert(self, nums: List[int], target: int) -> int:
+        l, r = 0, len(nums) - 1
+
+        while l <= r:
+            m = (l + r) // 2
+            if nums[m] == target:
+                return m
+            elif nums[m] < target:
+                l = m + 1
+            elif nums[m] > target:
+                r = m - 1
+
+        return (l + r) // 2 + 1
+```

apps/docs/content/(array)/42-trapping-rain-water.mdx

@@ -1,36 +0,0 @@
----
-title: '42. Trapping Rain Water'
-description: Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining
-sidebar:
-  label: 'Trapping Rain Water'
-  badge: 'Hard'
----
-
-<Badge variant="accent">Two Pointers</Badge>
-
-### Example 1:
-- Input: `height = [0,1,0,2,1,0,1,3,2,1,2,1]`
-- Output: `6`
-- Explanation: The above elevation map (black section) is represented by array `[0,1,0,2,1,0,1,3,2,1,2,1]`. In this case, `6` units of rain water (blue section) are being trapped.
-
-### Example 2:
-- Input: `height = [4,2,0,3,2,5]`
-- Output: `9`
-
-### Constraints:
-
-- `n == height.length`
-- `1 <= n <= 2 * 10^4`
-- `0 <= height[i] <= 10^5`
-
-## Solution
-
-```js
-/**
- * @param {number[]} height
- * @return {number}
- */
-var trap = function(height) {
-    
-};
-```

apps/docs/content/(stack)/155-min-stack.mdx

@@ -0,0 +1,56 @@
+---
+title: '155. Min Stack'
+description: Design a stack that supports push, pop, top, and retrieving the minimum element in constant time
+sidebar:
+  label: 'Min Stack'
+  badge: 'Medium'
+---
+
+<Badge variant="accent">Stack</Badge>
+
+::::warning
+You must implement a solution with O(1) time complexity for each function.
+::::
+
+### Example 1:
+- Input: ``
+- Output: ``
+- Explanation: Input `["MinStack","push","push","push","getMin","pop","top","getMin"]` [[],[-2],[0],[-3],[],[],[],[]] Output `[null,null,null,null,-3,null,0,-2]` Explanation MinStack minStack = new MinStack(); minStack.push(-2); minStack.push(0); minStack.push(-3); minStack.getMin(); // return `-3` minStack.pop(); minStack.top();    // return `0` minStack.getMin(); // return `-2`
+
+### Constraints:
+
+- `-2^31 <= val <= 2^31 - 1`
+- Methods pop, top and getMin operations will always be called on non-empty stacks.
+- At most 3 * 10^4 calls will be made to push, pop, top, and getMin.
+
+## Solution
+
+```py
+class MinStack:
+    def __init__(self):
+        self.stack = []
+        self.minStack = []
+
+    def push(self, value: int) -> None:
+        self.stack.append(value)
+        value = min(value, self.minStack[-1] if self.minStack else value)
+        self.minStack.append(value)
+
+    def pop(self) -> None:
+        self.stack.pop()
+        self.minStack.pop()
+
+    def top(self) -> int:
+        return self.stack[-1]
+
+    def getMin(self) -> int:
+        return self.minStack[-1]
+
+
+# Your MinStack object will be instantiated and called as such:
+# obj = MinStack()
+# obj.push(value)
+# obj.pop()
+# param_3 = obj.top()
+# param_4 = obj.getMin()
+```

apps/docs/content/(string)/20-valid-parentheses.mdx

@@ -0,0 +1,54 @@
+---
+title: '20. Valid Parentheses'
+description: Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid
+sidebar:
+  label: 'Valid Parentheses'
+  badge: 'Easy'
+---
+
+<Badge variant="accent">Stack</Badge>
+
+### Example 1:
+- Input: `s = "()"`
+- Output: `true`
+
+### Example 2:
+- Input: `s = "()[]{}"`
+- Output: `true`
+
+### Example 3:
+- Input: `s = "(]"`
+- Output: `false`
+
+### Example 4:
+- Input: `s = "([])"`
+- Output: `true`
+
+### Example 5:
+- Input: `s = "([)]"`
+- Output: `false`
+
+### Constraints:
+
+- `1 <= s.length <= 10^4`
+- `s` consists of parentheses only '()[]{}'.
+
+## Solution
+
+```py
+class Solution:
+    def isValid(self, s: str) -> bool:
+        stack = []
+        pairs = {")": "(", "]": "[", "}": "{"}
+
+        for c in s:
+            if c in pairs:
+                if stack and pairs[c] == stack[-1]:
+                    stack.pop()
+                else:
+                    return False
+            else:
+                stack.append(c)
+
+        return True if not stack else False
+```

apps/docs/islands/ProgressDashboard.tsx

@@ -35,6 +35,7 @@ interface Stats {
     deferred_total: number;
   }[];
   ladder: Record<Stage, number>;
+  /** week is the 1-based campaign week — the Worker converts from ISO. */
   gates: {
     week: number;
     issue: number | null;
@@ -76,7 +77,12 @@ function dayLabel(iso: string): string {
   return `${weekday} ${iso.slice(8)}`;
 }
 
-// ── shared styles (theme tokens only — no hand-rolled palette) ───
+// ── shared styles ────────────────────────────────────────────────
+// Theme tokens only, with two deliberate exceptions: the phase-bar sets get
+// fixed hues (accent-blue core, yellow optional, red deferred — they must be
+// distinguishable, not shades of one colour), and the last-7-days heatmap
+// reuses the GREENS ramp from apps/api/src/charts.ts so the page matches the
+// README/email heatmaps (level 0 stays a theme token so light mode works).
 
 const card: CSSProperties = {
   border: "1px solid var(--blume-border)",
@@ -142,32 +148,78 @@ function Header({ stats }: { stats: Stats }) {
   );
 }
 
+// One stacked bar per phase: solved core / optional / deferred segments over
+// a muted track sized by the phase's total problem count, so both phase size
+// and progress read at a glance.
+const SETS = [
+  ["core", "var(--blume-accent)"],
+  ["optional", "#d29922"],
+  ["deferred", "#e5534b"],
+] as const;
+
 function Phases({ stats }: { stats: Stats }) {
+  const maxTotal = Math.max(
+    1,
+    ...stats.phases.map((p) => p.core_total + p.optional_total + p.deferred_total),
+  );
   return (
     <div style={card}>
       <div style={heading}>Phases</div>
-      <table style={{ borderCollapse: "collapse", width: "100%" }}>
+      <div style={{ display: "flex", gap: "1rem", flexWrap: "wrap", marginBottom: "0.6rem" }}>
-        <tbody>
+        {SETS.map(([set, color]) => (
-          {stats.phases.map((p) => (
+          <span key={set} style={muted}>
-            <tr key={p.milestone}>
+            <span
-              <td style={{ padding: "0.2rem 1rem 0.2rem 0" }}>{p.name}</td>
+              style={{
-              <td style={{ padding: "0.2rem 1rem 0.2rem 0" }}>
+                display: "inline-block",
-                <Bar done={p.core_done} total={p.core_total} />{" "}
+                width: "0.65rem",
-                <span style={muted}>
+                height: "0.65rem",
-                  core {p.core_done}/{p.core_total}
+                borderRadius: "2px",
-                </span>
+                background: color,
-              </td>
+                marginRight: "0.35rem",
-              <td style={{ padding: "0.2rem 0" }}>
+              }}
-                <span style={muted}>
+            />
-                  optional {p.optional_done}/{p.optional_total}
+            {set}
-                  {p.deferred_total > 0 &&
+          </span>
-                    ` · deferred ${p.deferred_done}/${p.deferred_total}`}
+        ))}
-                </span>
+      </div>
-              </td>
+      {stats.phases.map((p) => {
-            </tr>
+        const total = p.core_total + p.optional_total + p.deferred_total;
-          ))}
+        const done = p.core_done + p.optional_done + p.deferred_done;
-        </tbody>
+        return (
-      </table>
+          <div
+            key={p.milestone}
+            title={`core ${p.core_done}/${p.core_total} · optional ${p.optional_done}/${p.optional_total} · deferred ${p.deferred_done}/${p.deferred_total}`}
+            style={{ display: "flex", alignItems: "center", gap: "0.75rem", padding: "0.25rem 0" }}
+          >
+            <span style={{ width: "9.5rem", flexShrink: 0 }}>{p.name}</span>
+            <span style={{ flex: 1 }}>
+              <span
+                style={{
+                  display: "flex",
+                  width: `${(total / maxTotal) * 100}%`,
+                  height: "0.65rem",
+                  borderRadius: "var(--blume-radius)",
+                  background: "var(--blume-muted)",
+                  overflow: "hidden",
+                }}
+              >
+                {SETS.map(([set, color]) => {
+                  const solved = p[`${set}_done`];
+                  return solved > 0 ? (
+                    <span
+                      key={set}
+                      style={{ width: `${(solved / total) * 100}%`, background: color }}
+                    />
+                  ) : null;
+                })}
+              </span>
+            </span>
+            <span style={{ ...muted, width: "3.5rem", textAlign: "right", flexShrink: 0 }}>
+              {done}/{total}
+            </span>
+          </div>
+        );
+      })}
     </div>
   );
 }
@@ -224,76 +276,95 @@ function Gates({ stats }: { stats: Stats }) {
     <div style={card}>
       <div style={heading}>Gate log</div>
       {stats.gates.length === 0 ? (
-        <span style={muted}>No gates yet.</span>
+        <span style={muted}>No gates yet — the first weekly review opens Saturday night.</span>
       ) : (
-        <table style={{ borderCollapse: "collapse", width: "100%" }}>
+        stats.gates.map((g) => (
-          <thead>
+          <div
-            <tr>
+            key={g.week}
-              {["Week", "Issue", "Pass rate", "Closed"].map((h) => (
+            style={{
-                <th key={h} style={{ ...muted, textAlign: "left", padding: "0.2rem 1rem 0.2rem 0" }}>
+              display: "flex",
-                  {h}
+              gap: "0.75rem",
-                </th>
+              alignItems: "baseline",
-              ))}
+              flexWrap: "wrap",
-            </tr>
+              padding: "0.15rem 0",
-          </thead>
+            }}
-          <tbody>
+          >
-            {stats.gates.map((g) => (
+            <span style={{ width: "4.5rem", flexShrink: 0 }}>Week {g.week}</span>
-              <tr key={g.week}>
+            {g.issue === null ? (
-                <td style={{ padding: "0.2rem 1rem 0.2rem 0" }}>{g.week}</td>
+              <span style={muted}>no review issue</span>
-                <td style={{ padding: "0.2rem 1rem 0.2rem 0" }}>
+            ) : (
-                  {g.issue === null ? (
+              <a
-                    <span style={muted}>—</span>
+                href={`https://github.com/prdlk/leetcode/issues/${g.issue}`}
-                  ) : (
+                target="_blank"
-                    <a
+                rel="noreferrer"
-                      href={`https://github.com/prdlk/leetcode/issues/${g.issue}`}
+              >
-                      target="_blank"
+                #{g.issue}
-                      rel="noreferrer"
+              </a>
-                    >
+            )}
-                      #{g.issue}
+            {g.pass_rate === null ? (
-                    </a>
+              <span style={muted}>in progress</span>
-                  )}
+            ) : (
-                </td>
+              <span>
-                <td style={{ padding: "0.2rem 1rem 0.2rem 0" }}>
+                {percent(g.pass_rate)} passed
-                  {g.pass_rate === null ? (
+                {g.closed_on && <span style={muted}> · closed {g.closed_on}</span>}
-                    <span style={muted}>open</span>
+              </span>
-                  ) : (
+            )}
-                    percent(g.pass_rate)
+          </div>
-                  )}
+        ))
-                </td>
-                <td style={{ padding: "0.2rem 0" }}>
-                  {g.closed_on ?? <span style={muted}>—</span>}
-                </td>
-              </tr>
-            ))}
-          </tbody>
-        </table>
       )}
+      <div style={{ ...muted, marginTop: "0.4rem" }}>
+        One gate per campaign week — scored when its review issue closes.
+      </div>
     </div>
   );
 }
 
+// GREENS ramp from apps/api/src/charts.ts; level 0 swapped for the theme's
+// muted token so an empty day looks right in both colour schemes.
+const GREENS = [
+  "var(--blume-muted)",
+  "#0e4429",
+  "#006d32",
+  "#26a641",
+  "#39d353",
+];
+
 function Recent({ stats }: { stats: Stats }) {
   return (
     <div style={card}>
       <div style={heading}>Last 7 days</div>
-      <div style={{ display: "flex", gap: "0.5rem", flexWrap: "wrap" }}>
+      <div style={{ display: "flex", gap: "0.4rem", flexWrap: "wrap" }}>
         {stats.recent.map((r) => (
           <span
             key={r.date}
-            style={{
+            title={`${r.date}: ${r.passes}/${r.attempts} passed`}
-              border: "1px solid var(--blume-border)",
+            style={{ textAlign: "center" }}
-              borderRadius: "var(--blume-radius)",
-              padding: "0.35rem 0.6rem",
-              textAlign: "center",
-            }}
           >
-            <span style={{ ...muted, display: "block" }}>{dayLabel(r.date)}</span>
+            <span
-            <strong>{r.passes}</strong>
+              style={{
-            <span style={muted}>/{r.attempts}</span>
+                display: "block",
+                width: "2.6rem",
+                height: "2rem",
+                borderRadius: "var(--blume-radius)",
+                background: GREENS[Math.min(r.attempts, 4)],
+              }}
+            />
+            <span style={{ ...muted, display: "block", marginTop: "0.25rem", fontSize: "0.75em" }}>
+              {dayLabel(r.date)}
+            </span>
           </span>
         ))}
       </div>
-      <div style={{ ...muted, marginTop: "0.4rem" }}>passes / attempts</div>
+      <div style={{ ...muted, marginTop: "0.5rem", display: "flex", alignItems: "center", gap: "0.25rem" }}>
+        <span>Less</span>
+        {GREENS.map((color) => (
+          <span
+            key={color}
+            style={{ display: "inline-block", width: "0.65rem", height: "0.65rem", borderRadius: "2px", background: color }}
+          />
+        ))}
+        <span>More · colour = attempts, hover for passes</span>
+      </div>
     </div>
   );
 }

work/Easy/Array/35.search-insert-position.py

@@ -0,0 +1,58 @@
+"""
+35. Search Insert Position
+Difficulty: Easy
+https://leetcode.com/problems/search-insert-position/
+
+──────────────────────────────────────────────────
+
+Given a sorted array of distinct integers and a target value, return
+the index if the target is found. If not, return the index where it
+would be if it were inserted in order.
+
+You must write an algorithm with O(log n) runtime complexity.
+
+
+
+Example 1:
+
+Input: nums = [1,3,5,6], target = 5
+Output: 2
+
+Example 2:
+
+Input: nums = [1,3,5,6], target = 2
+Output: 1
+
+Example 3:
+
+Input: nums = [1,3,5,6], target = 7
+Output: 4
+
+
+
+Constraints:
+
+        • 1 <= nums.length <= 10^4
+
+        • -10^4 <= nums[i] <= 10^4
+
+        • nums contains distinct values sorted in ascending order.
+
+        • -10^4 <= target <= 10^4
+"""
+
+
+class Solution:
+    def searchInsert(self, nums: List[int], target: int) -> int:
+        l, r = 0, len(nums) - 1
+
+        while l <= r:
+            m = (l + r) // 2
+            if nums[m] == target:
+                return m
+            elif nums[m] < target:
+                l = m + 1
+            elif nums[m] > target:
+                r = m - 1
+
+        return (l + r) // 2 + 1

work/Easy/String/20.valid-parentheses.py

@@ -0,0 +1,76 @@
+"""
+20. Valid Parentheses
+Difficulty: Easy
+https://leetcode.com/problems/valid-parentheses/
+
+──────────────────────────────────────────────────
+
+Given a string s containing just the characters '(', ')', '{', '}',
+'[' and ']', determine if the input string is valid.
+
+An input string is valid if:
+
+        • Open brackets must be closed by the same type of brackets.
+
+        • Open brackets must be closed in the correct order.
+
+• Every close bracket has a corresponding open bracket of the same
+type.
+
+
+
+Example 1:
+
+Input: s = "()"
+
+Output: true
+
+Example 2:
+
+Input: s = "()[]{}"
+
+Output: true
+
+Example 3:
+
+Input: s = "(]"
+
+Output: false
+
+Example 4:
+
+Input: s = "([])"
+
+Output: true
+
+Example 5:
+
+Input: s = "([)]"
+
+Output: false
+
+
+
+Constraints:
+
+        • 1 <= s.length <= 10^4
+
+        • s consists of parentheses only '()[]{}'.
+"""
+
+
+class Solution:
+    def isValid(self, s: str) -> bool:
+        stack = []
+        pairs = {")": "(", "]": "[", "}": "{"}
+
+        for c in s:
+            if c in pairs:
+                if stack and pairs[c] == stack[-1]:
+                    stack.pop()
+                else:
+                    return False
+            else:
+                stack.append(c)
+
+        return True if not stack else False

work/Hard/Array/42.trapping-rain-water.js

@@ -1,44 +0,0 @@
-/*
- * 42. Trapping Rain Water
- * Difficulty: Hard
- * https://leetcode.com/problems/trapping-rain-water/
- * 
- * ──────────────────────────────────────────────────
- * 
- * Given n non-negative integers representing an elevation map where the
- * width of each bar is 1, compute how much water it can trap after
- * raining.
- * 
- *  
- * 
- * Example 1:
- * 
- * Input: height = [0,1,0,2,1,0,1,3,2,1,2,1]
- * Output: 6
- * Explanation: The above elevation map (black section) is represented
- * by array [0,1,0,2,1,0,1,3,2,1,2,1]. In this case, 6 units of rain
- * water (blue section) are being trapped.
- * 
- * Example 2:
- * 
- * Input: height = [4,2,0,3,2,5]
- * Output: 9
- * 
- *  
- * 
- * Constraints:
- * 
- * 	• n == height.length
- * 
- * 	• 1 <= n <= 2 * 10^4
- * 
- * 	• 0 <= height[i] <= 10^5
-*/
-
-/**
- * @param {number[]} height
- * @return {number}
- */
-var trap = function(height) {
-    
-};

work/Medium/Array/150.evaluate-reverse-polish-notation.py

@@ -0,0 +1,88 @@
+"""
+150. Evaluate Reverse Polish Notation
+Difficulty: Medium
+https://leetcode.com/problems/evaluate-reverse-polish-notation/
+
+──────────────────────────────────────────────────
+
+You are given an array of strings tokens that represents an
+arithmetic expression in a Reverse Polish Notation.
+
+Evaluate the expression. Return an integer that represents the value
+of the expression.
+
+Note that:
+
+        • The valid operators are '+', '-', '*', and '/'.
+
+        • Each operand may be an integer or another expression.
+
+        • The division between two integers always truncates toward zero.
+
+        • There will not be any division by zero.
+
+• The input represents a valid arithmetic expression in a reverse
+polish notation.
+
+• The answer and all the intermediate calculations can be
+represented in a 32-bit integer.
+
+
+
+Example 1:
+
+Input: tokens = ["2","1","+","3","*"]
+Output: 9
+Explanation: ((2 + 1) * 3) = 9
+
+Example 2:
+
+Input: tokens = ["4","13","5","/","+"]
+Output: 6
+Explanation: (4 + (13 / 5)) = 6
+
+Example 3:
+
+Input: tokens =
+["10","6","9","3","+","-11","*","/","*","17","+","5","+"]
+Output: 22
+Explanation: ((10 * (6 / ((9 + 3) * -11))) + 17) + 5
+= ((10 * (6 / (12 * -11))) + 17) + 5
+= ((10 * (6 / -132)) + 17) + 5
+= ((10 * 0) + 17) + 5
+= (0 + 17) + 5
+= 17 + 5
+= 22
+
+
+
+Constraints:
+
+        • 1 <= tokens.length <= 10^4
+
+• tokens[i] is either an operator: "+", "-", "*", or "/", or an
+integer in the range [-200, 200].
+"""
+
+
+class Solution:
+    def evalRPN(self, tokens: List[str]) -> int:
+        stack = []
+        operations = {
+            "+": lambda x, y: int(x + y),
+            "-": lambda x, y: int(x - y),
+            "*": lambda x, y: int(x * y),
+            "/": lambda x, y: int(x / y),
+        }
+
+        for c in tokens:
+            if c in operations:
+                y = stack.pop()
+                x = stack.pop()
+                calc_func = operations[c]
+                result = calc_func(x, y)
+                stack.append(result)
+            else:
+                stack.append(int(c))
+
+        return stack[0]

work/Medium/Stack/155.min-stack.py

@@ -0,0 +1,86 @@
+"""
+155. Min Stack
+Difficulty: Medium
+https://leetcode.com/problems/min-stack/
+
+──────────────────────────────────────────────────
+
+Design a stack that supports push, pop, top, and retrieving the
+minimum element in constant time.
+
+Implement the MinStack class:
+
+        • MinStack() initializes the stack object.
+
+        • void push(int value) pushes the element value onto the stack.
+
+        • void pop() removes the element on the top of the stack.
+
+        • int top() gets the top element of the stack.
+
+        • int getMin() retrieves the minimum element in the stack.
+
+You must implement a solution with O(1) time complexity for each
+function.
+
+
+
+Example 1:
+
+Input
+["MinStack","push","push","push","getMin","pop","top","getMin"]
+[[],[-2],[0],[-3],[],[],[],[]]
+
+Output
+[null,null,null,null,-3,null,0,-2]
+
+Explanation
+MinStack minStack = new MinStack();
+minStack.push(-2);
+minStack.push(0);
+minStack.push(-3);
+minStack.getMin(); // return -3
+minStack.pop();
+minStack.top();    // return 0
+minStack.getMin(); // return -2
+
+
+
+Constraints:
+
+        • -2^31 <= val <= 2^31 - 1
+
+• Methods pop, top and getMin operations will always be called on
+non-empty stacks.
+
+        • At most 3 * 10^4 calls will be made to push, pop, top, and getMin.
+"""
+
+
+class MinStack:
+    def __init__(self):
+        self.stack = []
+        self.minStack = []
+
+    def push(self, value: int) -> None:
+        self.stack.append(value)
+        value = min(value, self.minStack[-1] if self.minStack else value)
+        self.minStack.append(value)
+
+    def pop(self) -> None:
+        self.stack.pop()
+        self.minStack.pop()
+
+    def top(self) -> int:
+        return self.stack[-1]
+
+    def getMin(self) -> int:
+        return self.minStack[-1]
+
+
+# Your MinStack object will be instantiated and called as such:
+# obj = MinStack()
+# obj.push(value)
+# obj.pop()
+# param_3 = obj.top()
+# param_4 = obj.getMin()