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Problems

335 problems

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

With video · 335 results

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TitleSolutionAcceptDifficultyTopics
94. Binary Tree Inorder TraversalVideo
Solution80.4%Easy
Binary Tree, Depth-First Search +2· 7 companies
98. Validate Binary Search TreeVideo
Solution36.1%Medium
Binary Search Tree, Binary Tree +2· 18 companies
99. Recover Binary Search TreeVideo
Solution60.9%Medium
Binary Search Tree, Binary Tree +2· 8 companies
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
104. Maximum Depth of Binary TreeVideo
Solution78.6%Easy
Binary Tree, Breadth-First Search +2· 17 companies
110. Balanced Binary TreeVideo
Solution59.2%Easy
Binary Tree, Depth-First Search +1· 9 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
113. Path Sum IIVideo
Solution62.6%Medium
Backtracking, Binary Tree +2· 10 companies
114. Flatten Binary Tree to Linked ListVideo
Solution71.6%Medium
Binary Tree, Depth-First Search +3· 8 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
124. Binary Tree Maximum Path SumVideo
Solution42.7%Hard
Binary Tree, Depth-First Search +2· 25 companies
129. Sum Root to Leaf NumbersVideo
Solution70.3%Medium
Binary Tree, Depth-First Search +1· 7 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
144. Binary Tree Preorder TraversalVideo
Solution76.6%Easy
Binary Tree, Depth-First Search +2· 5 companies
145. Binary Tree Postorder TraversalVideo
Solution79.0%Easy
Binary Tree, Depth-First Search +2· 5 companies
156. Binary Tree Upside DownVideoPremium
Solution65.4%Medium
Binary Tree, Depth-First Search +1· 2 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
211. Design Add and Search Words Data StructureVideo
Solution48.9%Medium
Depth-First Search, Design +2· 13 companies
226. Invert Binary TreeVideo
Solution80.5%Easy
Binary Tree, Breadth-First Search +2· 9 companies
230. Kth Smallest Element in a BSTVideo
Solution77.2%Medium
Binary Search Tree, Binary Tree +2· 12 companies
235. Lowest Common Ancestor of a Binary Search TreeVideo
Solution71.4%Medium
Binary Search Tree, Binary Tree +2· 10 companies
236. Lowest Common Ancestor of a Binary TreeVideo
Solution70.1%Medium
Binary Tree, Depth-First Search +1· 22 companies
250. Count Univalue SubtreesVideoPremium
Solution57.5%Medium
Binary Tree, Depth-First Search +1· 4 companies
257. Binary Tree PathsVideo
Solution69.5%Easy
Backtracking, Binary Tree +3· 8 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
270. Closest Binary Search Tree ValueVideoPremium
Solution49.2%Easy
Binary Search, Binary Search Tree +3· 7 companies
272. Closest Binary Search Tree Value IIVideoPremium
Solution61.1%Hard
Binary Search Tree, Binary Tree +5· 3 companies
285. Inorder Successor in BSTVideoPremium
Solution51.2%Medium
Binary Search Tree, Binary Tree +2· 6 companies
297. Serialize and Deserialize Binary TreeVideo
Solution61.1%Hard
Binary Tree, Breadth-First Search +4· 23 companies
298. Binary Tree Longest Consecutive SequenceVideoPremium
Solution54.7%Medium
Binary Tree, Depth-First Search +1· 4 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
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
332. Reconstruct ItineraryVideo
Solution45.0%Hard
Depth-First Search, Eulerian Circuit +1· 23 companies
333. Largest BST SubtreeVideoPremium
Solution45.8%Medium
Binary Search Tree, Binary Tree +3· 2 companies
337. House Robber IIIVideo
Solution56.3%Medium
Binary Tree, Depth-First Search +2· 13 companies
339. Nested List Weight SumVideoPremium
Solution85.9%Medium
Breadth-First Search, Depth-First Search· 6 companies
341. Flatten Nested List IteratorVideo
Solution65.6%Medium
Depth-First Search, Design +4· 19 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
Showing 1–50 of 335