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Depth First Search
Depth First Search
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Number of Islands
MEDIUM
Binary Tree Maximum Path Sum
HARD
Lowest Common Ancestor of a Binary Tree
MEDIUM
Course Schedule
MEDIUM
Invert Binary Tree
EASY
Diameter of Binary Tree
EASY
Binary Tree Inorder Traversal
EASY
Flatten Binary Tree to Linked List
MEDIUM
Binary Tree Right Side View
MEDIUM
Kth Smallest Element in a BST
MEDIUM
Lowest Common Ancestor of a Binary Search Tree
MEDIUM
All Nodes Distance K in Binary Tree
MEDIUM
Course Schedule II
MEDIUM
Serialize and Deserialize Binary Tree
HARD
Cheapest Flights Within K Stops
MEDIUM
Max Area of Island
MEDIUM
Number of Provinces
MEDIUM
Path Sum
EASY
Populating Next Right Pointers in Each Node
MEDIUM
Clone Graph
MEDIUM
Evaluate Division
MEDIUM
Longest Increasing Path in a Matrix
HARD
Merge Two Binary Trees
EASY
Is Graph Bipartite?
MEDIUM
Minimum Height Trees
MEDIUM
Subtree of Another Tree
EASY
Sum Root to Leaf Numbers
MEDIUM
Path Sum II
MEDIUM
Vertical Order Traversal of a Binary Tree
HARD
Design Add and Search Words Data Structure
MEDIUM
Minimum Depth of Binary Tree
EASY
Range Sum of BST
EASY
Accounts Merge
MEDIUM
Island Perimeter
EASY
Binary Tree Paths
EASY
Reconstruct Itinerary
HARD
Trim a Binary Search Tree
MEDIUM
Average of Levels in Binary Tree
EASY
Convert BST to Greater Tree
MEDIUM
Flatten a Multilevel Doubly Linked List
MEDIUM
Maximum Difference Between Node and Ancestor
MEDIUM
Flatten Nested List Iterator
MEDIUM
Delete Nodes And Return Forest
MEDIUM
Binary Tree Pruning
MEDIUM
Alien Dictionary
HARD
Binary Search Tree to Greater Sum Tree
MEDIUM
Cousins in Binary Tree
EASY
Making A Large Island
HARD
Swim in Rising Water
HARD
Balance a Binary Search Tree
MEDIUM
Minimum Time to Collect All Apples in a Tree
MEDIUM
Find Largest Value in Each Tree Row
MEDIUM
Maximum Level Sum of a Binary Tree
MEDIUM
Serialize and Deserialize BST
MEDIUM
Binary Tree Vertical Order Traversal
MEDIUM
All Elements in Two Binary Search Trees
MEDIUM
Number of Connected Components in an Undirected Graph
MEDIUM
Smallest Subtree with all the Deepest Nodes
MEDIUM
Convert Binary Search Tree to Sorted Doubly Linked List
MEDIUM
Similar String Groups
HARD
Battleships in a Board
MEDIUM
Number of Distinct Islands
MEDIUM
Validate Binary Tree Nodes
MEDIUM
Minesweeper
MEDIUM
Lowest Common Ancestor of Deepest Leaves
MEDIUM
Closest Binary Search Tree Value
EASY
Nested List Weight Sum
MEDIUM
Find a Corresponding Node of a Binary Tree in a Clone of That Tree
EASY
Largest BST Subtree
MEDIUM
Boundary of Binary Tree
MEDIUM
The Maze II
MEDIUM
Remove Sub-Folders from the Filesystem
MEDIUM
Longest Absolute File Path
MEDIUM
Path With Maximum Minimum Value
MEDIUM
Binary Tree Longest Consecutive Sequence II
MEDIUM
Construct Binary Tree from String
MEDIUM
Closest Leaf in a Binary Tree
MEDIUM
Maximum Average Subtree
MEDIUM
Escape a Large Maze
HARD
Lowest Common Ancestor of a Binary Tree II
MEDIUM
Diameter of N-Ary Tree
MEDIUM
Path Sum IV
MEDIUM
Minimum Path Cost in a Hidden Grid
MEDIUM