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Problems

179 problems

Has videoPremium onlyReset
Binary TreeArray2,237String877Hash Table797Math691Dynamic Programming673Sorting508Greedy485Binary Search357Depth-First Search338Database308Bit Manipulation286Matrix279Tree264Breadth-First Search257Prefix Sum252All topics

179 results

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TitleSolutionAcceptDifficultyTopics
94. Binary Tree Inorder TraversalVideo
Solution80.4%Easy
Binary Tree, Depth-First Search +2· 7 companies
95. Unique Binary Search Trees IIVideo
Solution63.3%Medium
Backtracking, Binary Search Tree +3· 5 companies
96. Unique Binary Search TreesVideo
Solution64.0%Medium
Binary Search Tree, Binary Tree +3· 10 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
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
105. Construct Binary Tree from Preorder and Inorder TraversalVideo
Solution69.7%Medium
Array, Binary Tree +3· 9 companies
106. Construct Binary Tree from Inorder and Postorder TraversalVideo
Solution69.4%Medium
Array, Binary Tree +3· 7 companies
107. Binary Tree Level Order Traversal IIVideo
Solution69.0%Medium
Binary Tree, Breadth-First Search +1· 6 companies
108. Convert Sorted Array to Binary Search TreeVideo
Solution75.9%Easy
Array, Binary Search Tree +3· 9 companies
109. Convert Sorted List to Binary Search TreeVideo
Solution67.4%Medium
Binary Search Tree, Binary Tree +3· 9 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
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
173. Binary Search Tree IteratorVideo
Solution76.9%Medium
Binary Search Tree, Binary Tree +4· 8 companies
199. Binary Tree Right Side ViewVideo
Solution71.5%Medium
Binary Tree, Breadth-First Search +2· 14 companies
222. Count Complete Tree NodesVideo
Solution72.6%Medium
Binary Search, Binary Tree +2· 7 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
255. Verify Preorder Sequence in Binary Search TreeVideoPremium
Solution51.7%Medium
Array, Binary Search Tree +5· 5 companies
257. Binary Tree PathsVideo
Solution69.5%Easy
Backtracking, Binary Tree +3· 8 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
314. Binary Tree Vertical Order TraversalVideoPremium
Solution57.8%Medium
Binary Tree, Breadth-First Search +4· 9 companies
331. Verify Preorder Serialization of a Binary TreeVideo
Solution47.8%Medium
Binary Tree, Stack +2· 1 company
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
366. Find Leaves of Binary TreeVideoPremium
Solution81.4%Medium
Binary Tree, Depth-First Search +1· 6 companies
404. Sum of Left LeavesVideo
Solution63.1%Easy
Binary Tree, Breadth-First Search +2· 6 companies
426. Convert Binary Search Tree to Sorted Doubly Linked ListVideoPremium
Solution65.2%Medium
Binary Search Tree, Binary Tree +5· 4 companies
431. Encode N-ary Tree to Binary TreeVideoPremium
Solution80.6%Hard
Binary Tree, Breadth-First Search +3
Showing 1–50 of 179