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Problems

2,133 problems

Has videoPremium onlyReset
Array1,212Hash Table473String437Math331Greedy330Dynamic Programming327Sorting302Depth-First Search208Binary Search189Breadth-First Search166Matrix163Tree158Prefix Sum155Two Pointers150Database137All topics

Medium · 2,133 results

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TitleSolutionAcceptDifficultyTopics
429. N-ary Tree Level Order TraversalVideo
Solution71.6%Medium
Breadth-First Search, Tree· 3 companies
430. Flatten a Multilevel Doubly Linked ListVideo
Solution63.3%Medium
Depth-First Search, Doubly-Linked List +1· 6 companies
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 companies
435. Non-overlapping IntervalsVideo
Solution57.5%Medium
Array, Dynamic Programming +2· 18 companies
436. Find Right IntervalVideo
Solution56.7%Medium
Array, Binary Search +1· 4 companies
437. Path Sum IIIVideo
Solution46.6%Medium
Binary Tree, Depth-First Search +1· 11 companies
438. Find All Anagrams in a StringVideo
Solution54.7%Medium
Hash Table, Sliding Window +1· 15 companies
439. Ternary Expression ParserVideoPremium
Solution62.6%Medium
Recursion, Stack +1· 1 company
442. Find All Duplicates in an ArrayVideo
Solution76.8%Medium
Array, Hash Table· 11 companies
443. String CompressionVideo
Solution60.9%Medium
String, Two Pointers· 41 companies
444. Sequence ReconstructionVideoPremium
Solution31.2%Medium
Array, Graph +1· 2 companies
445. Add Two Numbers IIVideo
Solution63.1%Medium
Linked List, Math +1· 9 companies
447. Number of BoomerangsVideo
Solution58.0%Medium
Array, Hash Table +1· 2 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
450. Delete Node in a BSTVideo
Solution55.1%Medium
Binary Search Tree, Binary Tree +1· 11 companies
451. Sort Characters By FrequencyVideo
Solution75.8%Medium
Bucket Sort, Counting +4· 16 companies
452. Minimum Number of Arrows to Burst BalloonsVideo
Solution61.9%Medium
Array, Greedy +1· 8 companies
453. Minimum Moves to Equal Array ElementsVideo
Solution59.2%Medium
Array, Math· 8 companies
454. 4Sum IIVideo
Solution57.9%Medium
Array, Hash Table· 4 companies
456. 132 PatternVideo
Solution35.2%Medium
Array, Binary Search +3· 8 companies
457. Circular Array LoopVideo
Solution38.3%Medium
Array, Hash Table +1· 4 companies
462. Minimum Moves to Equal Array Elements IIVideo
Solution62.2%Medium
Array, Math +1· 5 companies
464. Can I WinVideo
Solution31.7%Medium
Bit Manipulation, Bitmask +4· 4 companies
467. Unique Substrings in Wraparound StringVideo
Solution44.0%Medium
Dynamic Programming, String· 2 companies
468. Validate IP AddressVideo
Solution28.2%Medium
String· 12 companies
469. Convex PolygonVideoPremium
Solution40.3%Medium
Array, Geometry +1· 1 company
470. Implement Rand10() Using Rand7()Video
Solution47.0%Medium
Math, Probability and Statistics +2· 6 companies
473. Matchsticks to SquareVideo
Solution42.3%Medium
Array, Backtracking +3· 9 companies
474. Ones and ZeroesVideo
Solution53.7%Medium
Array, Dynamic Programming +1· 5 companies
475. HeatersVideo
Solution42.3%Medium
Array, Binary Search +2· 12 companies
477. Total Hamming DistanceVideo
Solution55.3%Medium
Array, Bit Manipulation +1· 3 companies
478. Generate Random Point in a CircleVideo
Solution43.8%Medium
Geometry, Math +2· 2 companies
481. Magical StringVideo
Solution56.6%Medium
String, Two Pointers· 3 companies
484. Find PermutationVideoPremium
Solution67.0%Medium
Array, Greedy +2· 1 company
486. Predict the WinnerVideo
Solution59.7%Medium
Array, Dynamic Programming +3· 6 companies
487. Max Consecutive Ones IIVideoPremium
Solution52.0%Medium
Array, Dynamic Programming +1· 4 companies
490. The MazeVideoPremium
Solution60.4%Medium
Array, Breadth-First Search +2· 13 companies
491. Non-decreasing SubsequencesVideo
Solution63.1%Medium
Array, Backtracking +2· 3 companies
494. Target SumVideo
Solution52.6%Medium
Array, Backtracking +1· 10 companies
497. Random Point in Non-overlapping RectanglesVideo
Solution40.8%Medium
Array, Binary Search +5· 2 companies
498. Diagonal TraverseVideo
Solution67.1%Medium
Array, Matrix +1· 12 companies
503. Next Greater Element IIVideo
Solution69.3%Medium
Array, Monotonic Stack +1· 16 companies
505. The Maze IIVideoPremium
Solution55.0%Medium
Array, Breadth-First Search +5· 5 companies
508. Most Frequent Subtree SumVideo
Solution69.6%Medium
Binary Tree, Depth-First Search +2· 3 companies
510. Inorder Successor in BST IIVideoPremium
Solution60.9%Medium
Binary Search Tree, Binary Tree +1· 3 companies
513. Find Bottom Left Tree ValueVideo
Solution72.2%Medium
Binary Tree, Breadth-First Search +2· 7 companies
515. Find Largest Value in Each Tree RowVideo
Solution66.3%Medium
Binary Tree, Breadth-First Search +2· 8 companies
516. Longest Palindromic SubsequenceVideo
Solution65.8%Medium
Dynamic Programming, String· 15 companies
518. Coin Change IIVideo
Solution59.1%Medium
Array, Dynamic Programming· 11 companies
519. Random Flip MatrixVideo
Solution46.9%Medium
Hash Table, Math +2· 1 company
Showing 251–300 of 2,133