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Problems

255 problems

Has videoPremium onlyReset
Array2,209String870Hash Table786Math682Dynamic Programming666Sorting504Greedy480Binary Search352Depth-First Search335Database303Bit Manipulation283Matrix278Tree261Breadth-First Search255Two Pointers249All topics

With video · 255 results

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TitleSolutionAcceptDifficultyTopics
100. Same TreeVideo
Solution68.0%Easy
Binary Tree, Breadth-First Search +2· 9 companies
101. Symmetric TreeVideo
Solution62.1%Easy
Binary Tree, Breadth-First Search +2· 11 companies
102. Binary Tree Level Order TraversalVideo
Solution73.5%Medium
Binary Tree, Breadth-First Search +1· 16 companies
103. Binary Tree Zigzag Level Order TraversalVideo
Solution64.4%Medium
Binary Tree, Breadth-First Search +1· 19 companies
104. Maximum Depth of Binary TreeVideo
Solution78.6%Easy
Binary Tree, Breadth-First Search +2· 17 companies
107. Binary Tree Level Order Traversal IIVideo
Solution69.0%Medium
Binary Tree, Breadth-First Search +1· 6 companies
111. Minimum Depth of Binary TreeVideo
Solution53.7%Easy
Binary Tree, Breadth-First Search +2· 7 companies
112. Path SumVideo
Solution55.8%Easy
Binary Tree, Breadth-First Search +2· 9 companies
116. Populating Next Right Pointers in Each NodeVideo
Solution67.6%Medium
Binary Tree, Breadth-First Search +3· 8 companies
117. Populating Next Right Pointers in Each Node IIVideo
Solution57.9%Medium
Binary Tree, Breadth-First Search +3· 7 companies
126. Word Ladder IIVideo
Solution27.7%Hard
Backtracking, Breadth-First Search +2· 15 companies
127. Word LadderVideo
Solution46.3%Hard
Breadth-First Search, Hash Table +1· 41 companies
130. Surrounded RegionsVideo
Solution46.1%Medium
Array, Breadth-First Search +3· 12 companies
133. Clone GraphVideo
Solution66.1%Medium
Breadth-First Search, Depth-First Search +2· 18 companies
199. Binary Tree Right Side ViewVideo
Solution71.5%Medium
Binary Tree, Breadth-First Search +2· 14 companies
200. Number of IslandsVideo
Solution65.2%Medium
Array, Breadth-First Search +3· 86 companies
207. Course ScheduleVideo
Solution52.2%Medium
Breadth-First Search, Depth-First Search +2· 45 companies
210. Course Schedule IIVideo
Solution56.3%Medium
Breadth-First Search, Depth-First Search +2· 36 companies
226. Invert Binary TreeVideo
Solution80.5%Easy
Binary Tree, Breadth-First Search +2· 9 companies
261. Graph Valid TreeVideoPremium
Solution49.9%Medium
Breadth-First Search, Depth-First Search +2· 9 companies
269. Alien DictionaryVideoPremium
Solution37.1%Hard
Array, Breadth-First Search +4· 18 companies
279. Perfect SquaresVideo
Solution57.0%Medium
Breadth-First Search, Dynamic Programming +1· 12 companies
286. Walls and GatesVideoPremium
Solution63.9%Medium
Array, Breadth-First Search +1· 11 companies
297. Serialize and Deserialize Binary TreeVideo
Solution61.1%Hard
Binary Tree, Breadth-First Search +4· 23 companies
301. Remove Invalid ParenthesesVideo
Solution52.4%Hard
Backtracking, Breadth-First Search +1· 10 companies
302. Smallest Rectangle Enclosing Black PixelsVideoPremium
Solution60.9%Hard
Array, Binary Search +3· 1 company
310. Minimum Height TreesVideo
Solution42.4%Medium
Breadth-First Search, Depth-First Search +2· 7 companies
314. Binary Tree Vertical Order TraversalVideoPremium
Solution57.8%Medium
Binary Tree, Breadth-First Search +4· 9 companies
317. Shortest Distance from All BuildingsVideoPremium
Solution44.9%Hard
Array, Breadth-First Search +1· 15 companies
322. Coin ChangeVideo
Solution49.3%Medium
Array, Breadth-First Search +1· 40 companies
323. Number of Connected Components in an Undirected GraphVideoPremium
Solution64.9%Medium
Breadth-First Search, Depth-First Search +2· 7 companies
329. Longest Increasing Path in a MatrixVideo
Solution57.0%Hard
Array, Breadth-First Search +6· 16 companies
339. Nested List Weight SumVideoPremium
Solution85.9%Medium
Breadth-First Search, Depth-First Search· 6 companies
364. Nested List Weight Sum IIVideoPremium
Solution66.8%Medium
Breadth-First Search, Depth-First Search +1· 3 companies
365. Water and Jug ProblemVideo
Solution46.4%Medium
Breadth-First Search, Depth-First Search +1· 8 companies
399. Evaluate DivisionVideo
Solution64.7%Medium
Array, Breadth-First Search +5· 23 companies
404. Sum of Left LeavesVideo
Solution63.1%Easy
Binary Tree, Breadth-First Search +2· 6 companies
407. Trapping Rain Water IIVideo
Solution64.0%Hard
Array, Breadth-First Search +2· 14 companies
417. Pacific Atlantic Water FlowVideo
Solution61.3%Medium
Array, Breadth-First Search +2· 11 companies
428. Serialize and Deserialize N-ary TreeVideoPremium
Solution68.7%Hard
Breadth-First Search, Depth-First Search +2· 7 companies
429. N-ary Tree Level Order TraversalVideo
Solution71.6%Medium
Breadth-First Search, Tree· 3 companies
431. Encode N-ary Tree to Binary TreeVideoPremium
Solution80.6%Hard
Binary Tree, Breadth-First Search +3
433. Minimum Genetic MutationVideo
Solution57.1%Medium
Breadth-First Search, Hash Table +1· 6 companies
449. Serialize and Deserialize BSTVideo
Solution60.1%Medium
Binary Search Tree, Binary Tree +5· 4 companies
463. Island PerimeterVideo
Solution74.3%Easy
Array, Breadth-First Search +2· 9 companies
488. Zuma GameVideo
Solution29.4%Hard
Breadth-First Search, Dynamic Programming +3· 7 companies
490. The MazeVideoPremium
Solution60.4%Medium
Array, Breadth-First Search +2· 13 companies
499. The Maze IIIVideoPremium
Solution52.3%Hard
Array, Breadth-First Search +6· 1 company
505. The Maze IIVideoPremium
Solution55.0%Medium
Array, Breadth-First Search +5· 5 companies
513. Find Bottom Left Tree ValueVideo
Solution72.2%Medium
Binary Tree, Breadth-First Search +2· 7 companies
Showing 1–50 of 255