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158 problems

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Array1,212 Hash Table473 String437 Math331 Greedy330 Dynamic Programming327 Sorting302 Depth-First Search208 Binary Search189 Breadth-First Search166 Matrix163 Tree158 Prefix Sum155 Two Pointers150 Database137 All topics

Medium · 158 results

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TitleSolutionAcceptDifficultyTopics

652. Find Duplicate SubtreesVideo

Solution60.6%Medium

Binary Tree, Depth-First Search +2· 8 companies

654. Maximum Binary TreeVideo

Solution86.3%Medium

Array, Binary Tree +4· 3 companies

655. Print Binary TreeVideo

Solution67.1%Medium

Binary Tree, Breadth-First Search +2· 5 companies

662. Maximum Width of Binary TreeVideo

Solution46.0%Medium

Binary Tree, Breadth-First Search +2· 8 companies

663. Equal Tree PartitionVideoPremium

Solution42.3%Medium

Binary Tree, Depth-First Search +1· 1 company

666. Path Sum IVVideoPremium

Solution62.5%Medium

Array, Binary Tree +3· 1 company

669. Trim a Binary Search TreeVideo

Solution66.9%Medium

Binary Search Tree, Binary Tree +2· 4 companies

687. Longest Univalue PathVideo

Solution44.3%Medium

Binary Tree, Depth-First Search +1· 7 companies

690. Employee ImportanceVideo

Solution69.4%Medium

Array, Breadth-First Search +3· 6 companies

701. Insert into a Binary Search TreeVideo

Solution73.6%Medium

Binary Search Tree, Binary Tree +1· 7 companies

742. Closest Leaf in a Binary TreeVideoPremium

Solution47.4%Medium

Binary Tree, Breadth-First Search +2· 3 companies

776. Split BSTVideoPremium

Solution82.5%Medium

Binary Search Tree, Binary Tree +2· 2 companies

814. Binary Tree PruningVideo

Solution72.3%Medium

Binary Tree, Depth-First Search +1· 5 companies

863. All Nodes Distance K in Binary TreeVideo

Solution68.1%Medium

Binary Tree, Breadth-First Search +3· 16 companies

865. Smallest Subtree with all the Deepest NodesVideo

Solution77.5%Medium

Binary Tree, Breadth-First Search +3· 4 companies

889. Construct Binary Tree from Preorder and Postorder TraversalVideo

Solution78.0%Medium

Array, Binary Tree +3· 6 companies

894. All Possible Full Binary TreesVideo

Solution82.8%Medium

Binary Tree, Dynamic Programming +3· 5 companies

919. Complete Binary Tree InserterVideo

Solution65.0%Medium

Binary Tree, Breadth-First Search +2· 3 companies

951. Flip Equivalent Binary TreesVideo

Solution69.8%Medium

Binary Tree, Depth-First Search +1· 4 companies

958. Check Completeness of a Binary TreeVideo

Solution59.6%Medium

Binary Tree, Breadth-First Search +1· 5 companies

971. Flip Binary Tree To Match Preorder TraversalVideo

Solution51.9%Medium

Binary Tree, Depth-First Search +1

979. Distribute Coins in Binary TreeVideo

Solution77.2%Medium

Binary Tree, Depth-First Search +1· 8 companies

988. Smallest String Starting From LeafVideo

Solution61.2%Medium

Backtracking, Binary Tree +3· 2 companies

998. Maximum Binary Tree IIVideo

Solution70.8%Medium

Binary Tree, Tree· 1 company

1008. Construct Binary Search Tree from Preorder TraversalVideo

Solution84.7%Medium

Array, Binary Search Tree +4· 5 companies

1026. Maximum Difference Between Node and AncestorVideo

Solution78.1%Medium

Binary Tree, Depth-First Search +1· 5 companies

1038. Binary Search Tree to Greater Sum TreeVideo

Solution88.3%Medium

Binary Search Tree, Binary Tree +2· 3 companies

1080. Insufficient Nodes in Root to Leaf PathsVideo

Solution55.6%Medium

Binary Tree, Depth-First Search +1· 1 company

1104. Path In Zigzag Labelled Binary TreeVideo

Solution75.9%Medium

Binary Tree, Math +1· 2 companies

1110. Delete Nodes And Return ForestVideo

Solution72.4%Medium

Array, Binary Tree +3· 4 companies

1120. Maximum Average SubtreeVideoPremium

Solution66.7%Medium

Binary Tree, Depth-First Search +1· 1 company

1123. Lowest Common Ancestor of Deepest LeavesVideo

Solution79.5%Medium

Binary Tree, Breadth-First Search +3· 4 companies

1145. Binary Tree Coloring GameVideo

Solution52.9%Medium

Binary Tree, Depth-First Search +1· 2 companies

1161. Maximum Level Sum of a Binary TreeVideo

Solution70.0%Medium

Binary Tree, Breadth-First Search +2· 4 companies

1214. Two Sum BSTsVideoPremium

Solution68.2%Medium

Binary Search, Binary Search Tree +5· 1 company

1245. Tree DiameterVideoPremium

Solution61.1%Medium

Breadth-First Search, Depth-First Search +3· 7 companies

1257. Smallest Common RegionVideoPremium

Solution68.6%Medium

Array, Breadth-First Search +4· 1 company

1261. Find Elements in a Contaminated Binary TreeVideo

Solution84.1%Medium

Binary Tree, Breadth-First Search +4· 2 companies

1273. Delete Tree NodesVideoPremium

Solution61.2%Medium

Array, Breadth-First Search +2· 1 company

1302. Deepest Leaves SumVideo

Solution86.3%Medium

Binary Tree, Breadth-First Search +2· 3 companies

1305. All Elements in Two Binary Search TreesVideo

Solution80.5%Medium

Binary Search Tree, Binary Tree +3· 2 companies

1315. Sum of Nodes with Even-Valued GrandparentVideo

Solution85.6%Medium

Binary Tree, Breadth-First Search +2· 4 companies

1325. Delete Leaves With a Given ValueVideo

Solution77.4%Medium

Binary Tree, Depth-First Search +1· 4 companies

1339. Maximum Product of Splitted Binary TreeVideo

Solution55.7%Medium

Binary Tree, Depth-First Search +1· 5 companies

1361. Validate Binary Tree NodesVideo

Solution44.3%Medium

Binary Tree, Breadth-First Search +4· 3 companies

1367. Linked List in Binary TreeVideo

Solution52.1%Medium

Binary Tree, Depth-First Search +2· 5 companies

1372. Longest ZigZag Path in a Binary TreeVideo

Solution67.0%Medium

Binary Tree, Depth-First Search +2· 2 companies

1376. Time Needed to Inform All EmployeesVideo

Solution60.6%Medium

Breadth-First Search, Depth-First Search +1· 5 companies

1382. Balance a Binary Search TreeVideo

Solution86.3%Medium

Binary Search Tree, Binary Tree +4· 5 companies

1430. Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary TreeVideoPremium

Solution47.6%Medium

Binary Tree, Breadth-First Search +2

Showing 51–100 of 158