Problem Library

Master these coding challenges to ace your next technical interview. Handpicked problems with personalized spaced repetition.

Showing 1-14 of 14 matching problems in SDE Sheet.

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Array30Dynamic Programming14Depth-First Search10

These are the topics showing up most often in your current queue.

Title	Difficulty	Topics
42. Trapping Rain Water Open source	Hard	ArrayTwo PointersDynamic Programming+2 more
53. Maximum Subarray Open source	Medium	ArrayDivide and ConquerDynamic Programming
62. Unique Paths Open source	Medium	MathDynamic ProgrammingCombinatorics
70. Climbing Stairs Open source	Easy	MathDynamic ProgrammingMemoization
91. Decode Ways Open source	Medium	StringDynamic Programming
118. Pascal's Triangle Open source	Easy	ArrayDynamic Programming
121. Best Time to Buy and Sell Stock Open source	Easy	ArrayDynamic Programming
139. Word Break Open source	Medium	ArrayHash TableString+4 more
152. Maximum Product Subarray Open source	Medium	ArrayDynamic Programming
198. House Robber Open source	Medium	ArrayDynamic Programming
300. Longest Increasing Subsequence Open source	Medium	ArrayBinary SearchDynamic Programming+1 more
322. Coin Change Open source	Medium	ArrayDynamic ProgrammingBreadth-First Search+2 more
416. Partition Equal Subset Sum Open source	Medium	ArrayDynamic ProgrammingKnapsack Problem+1 more
1143. Longest Common Subsequence Open source	Medium	StringDynamic ProgrammingLongest Common Subsequence