Problem Library

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

All tracks Blind 75 NeetCode 150 NeetCode 250 Striver A to Z SDE Sheet

Showing 1-25 of 26 matching problems in NeetCode 150.

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Array80Dynamic Programming35String33

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Title	Difficulty	Topics
100. Same Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more
102. Binary Tree Level Order Traversal Open source	Medium	TreeBreadth-First SearchBinary Tree
104. Maximum Depth of Binary Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more
127. Word Ladder Open source	Hard	Hash TableStringBreadth-First Search+1 more
130. Surrounded Regions Open source	Medium	ArrayDepth-First SearchBreadth-First Search+2 more
133. Clone Graph Open source	Medium	Hash TableDepth-First SearchBreadth-First Search+1 more
199. Binary Tree Right Side View Open source	Medium	TreeDepth-First SearchBreadth-First Search+1 more
200. Number of Islands Open source	Medium	ArrayDepth-First SearchBreadth-First Search+2 more
207. Course Schedule Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+2 more
210. Course Schedule II Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+1 more
226. Invert Binary Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more
261. Graph Valid Tree Open sourcePremium	Medium	Depth-First SearchBreadth-First SearchUnion-Find+1 more
269. Alien Dictionary Open sourcePremium	Hard	ArrayStringDepth-First Search+4 more
286. Walls and Gates Open sourcePremium	Medium	ArrayBreadth-First SearchMatrix
297. Serialize and Deserialize Binary Tree Open source	Hard	StringTreeDepth-First Search+3 more
322. Coin Change Open source	Medium	ArrayDynamic ProgrammingBreadth-First Search+2 more
323. Number of Connected Components in an Undirected Graph Open sourcePremium	Medium	Depth-First SearchBreadth-First SearchUnion-Find+1 more
329. Longest Increasing Path in a Matrix Open source	Hard	ArrayDynamic ProgrammingDepth-First Search+6 more
417. Pacific Atlantic Water Flow Open source	Medium	ArrayDepth-First SearchBreadth-First Search+1 more
684. Redundant Connection Open source	Medium	Depth-First SearchBreadth-First SearchUnion-Find+1 more
695. Max Area of Island Open source	Medium	ArrayDepth-First SearchBreadth-First Search+2 more
743. Network Delay Time Open source	Medium	Depth-First SearchBreadth-First SearchGraph Theory+3 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