Problem Library

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

Showing 26-34 of 34 matching problems in NeetCode 250.

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Array141Dynamic Programming55String53

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Title	Difficulty	Topics
721. Accounts Merge Open source	Medium	ArrayHash TableString+4 more
743. Network Delay Time Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+3 more
752. Open the Lock Open source	Medium	ArrayHash TableString+2 more
778. Swim in Rising Water Open source	Hard	ArrayBinary SearchDepth-First Search+6 more
787. Cheapest Flights Within K Stops Open source	Medium	Dynamic ProgrammingDepth-First SearchBreadth-First Search+3 more
994. Rotting Oranges Open source	Medium	ArrayBreadth-First SearchMatrix
1448. Count Good Nodes in Binary Tree Open source	Medium	TreeDepth-First SearchBreadth-First Search+1 more
1462. Course Schedule IV Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+1 more
1631. Path With Minimum Effort Open source	Medium	ArrayBinary SearchDepth-First Search+5 more