SoloMock
— mock interviews, solo
[E] Two Sum — Hash map
[E] Valid Parentheses — Stack
[E] Best Time to Buy and Sell Stock — One-pass / sliding window
[E] Climbing Stairs — DP / Fibonacci
[E] Reverse Linked List — Linked list pointer manipulation
[E] Valid Anagram — Hash map / counting
[M] Container With Most Water — Two pointers
[M] Longest Substring Without Repeating Characters — Sliding window
[M] Group Anagrams — Hash map + canonical key
[M] Product of Array Except Self — Prefix/suffix products
[M] Number of Islands — BFS/DFS on grid
[M] Coin Change — DP — unbounded knapsack
[M] Course Schedule — Topological sort / cycle detection
[H] Trapping Rain Water — Two pointers / monotonic stack
[M] Word Break — DP — string segmentation
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