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Depth First Search
Depth First Search
0/25 solved
Number of Islands
MEDIUM
Validate Binary Search Tree
MEDIUM
Lowest Common Ancestor of a Binary Tree
MEDIUM
Symmetric Tree
EASY
Diameter of Binary Tree
EASY
Maximum Depth of Binary Tree
EASY
Same Tree
EASY
Lowest Common Ancestor of a Binary Search Tree
MEDIUM
Serialize and Deserialize Binary Tree
HARD
Max Area of Island
MEDIUM
Design Add and Search Words Data Structure
MEDIUM
Accounts Merge
MEDIUM
Two Sum IV - Input is a BST
EASY
Flatten Nested List Iterator
MEDIUM
Find Largest Value in Each Tree Row
MEDIUM
Graph Valid Tree
MEDIUM
Find Leaves of Binary Tree
MEDIUM
Number of Connected Components in an Undirected Graph
MEDIUM
Second Minimum Node In a Binary Tree
EASY
Nested List Weight Sum
MEDIUM
Recover a Tree From Preorder Traversal
HARD
Flower Planting With No Adjacent
MEDIUM
Closest Binary Search Tree Value II
HARD
Nested List Weight Sum II
MEDIUM
Binary Tree Upside Down
MEDIUM