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 151-175 of 250 matching problems in NeetCode 250.

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All topics 0-1 Knapsack Algorithm X Array Backtracking Bellman–Ford Algorithm Bidirectional Search Binary Lifting Binary Search Binary Search Tree Binary Tree Bit Manipulation Bitmask Borůvka's Algorithm Boyer–Moore Majority Vote Algorithm Bracket Sequences Breadth-First Search Brute-Force Search Bubble Sort

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Array141Dynamic Programming55String53

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

Title	Difficulty	Topics
343. Integer Break Open source	Medium	MathDynamic Programming
344. Reverse String Open source	Easy	Two PointersString
347. Top K Frequent Elements Open source	Medium	ArrayHash TableDivide and Conquer+5 more
355. Design Twitter Open source	Medium	Hash TableLinked ListDesign+1 more
371. Sum of Two Integers Open source	Medium	MathBit Manipulation
374. Guess Number Higher or Lower Open source	Easy	Binary SearchInteractive
377. Combination Sum IV Open source	Medium	ArrayDynamic Programming
394. Decode String Open source	Medium	StringStackRecursion
399. Evaluate Division Open source	Medium	ArrayStringDepth-First Search+6 more
410. Split Array Largest Sum Open source	Hard	ArrayBinary SearchDynamic Programming+2 more
416. Partition Equal Subset Sum Open source	Medium	ArrayDynamic ProgrammingKnapsack Problem+1 more
417. Pacific Atlantic Water Flow Open source	Medium	ArrayDepth-First SearchBreadth-First Search+1 more
424. Longest Repeating Character Replacement Open source	Medium	Hash TableStringSliding Window
427. Construct Quad Tree Open source	Medium	ArrayDivide and ConquerTree+1 more
435. Non-overlapping Intervals Open source	Medium	ArrayDynamic ProgrammingGreedy+1 more
450. Delete Node in a BST Open source	Medium	TreeBinary Search TreeBinary Tree
460. LFU Cache Open source	Hard	Hash TableLinked ListDesign+1 more
463. Island Perimeter Open source	Easy	ArrayDepth-First SearchBreadth-First Search+1 more
473. Matchsticks to Square Open source	Medium	ArrayDynamic ProgrammingBacktracking+2 more
494. Target Sum Open source	Medium	ArrayDynamic ProgrammingBacktracking+2 more
502. IPO Open source	Hard	ArrayGreedySorting+1 more
518. Coin Change II Open source	Medium	ArrayDynamic ProgrammingKnapsack Problem+1 more
543. Diameter of Binary Tree Open source	Easy	TreeDepth-First SearchBinary Tree+1 more
560. Subarray Sum Equals K Open source	Medium	ArrayHash TablePrefix Sum
567. Permutation in String Open source	Medium	Hash TableTwo PointersString+1 more