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Depth First Search

Depth First Search

Overall Progress0/83(0%)

Easy

0/12

Medium

0/51

Hard

0/20

Number of Islands

Medium

Binary Tree Maximum Path Sum

Hard

Lowest Common Ancestor of a Binary Tree

Medium

Course Schedule

Medium

Easy

Invert Binary Tree

Easy

Diameter of Binary Tree

Easy

Binary Tree Inorder Traversal

Easy

Easy

All Nodes Distance K in Binary Tree

Medium

Course Schedule II

Medium

Serialize and Deserialize Binary Tree

Hard

Max Area of Island

Medium

Number of Provinces

Medium

Populating Next Right Pointers in Each Node

Medium

Medium

Evaluate Division

Medium

Longest Increasing Path in a Matrix

Hard

Surrounded Regions

Medium

Merge Two Binary Trees

Easy

Easy

Design Add and Search Words Data Structure

Medium

Pacific Atlantic Water Flow

Medium

Range Sum of BST

Easy

Medium

Binary Tree Paths

Easy

Path With Minimum Effort

Medium

Reconstruct Itinerary

Hard

Most Stones Removed with Same Row or Column

Medium

Find Duplicate Subtrees

Medium

Trim a Binary Search Tree

Medium

Sum of Distances in Tree

Hard

Shortest Bridge

Medium

Binary Tree Cameras

Hard

Deepest Leaves Sum

Medium

Possible Bipartition

Medium

Delete Nodes And Return Forest

Medium

Number of Closed Islands

Medium

Alien Dictionary

Hard

Minimum Absolute Difference in BST

Easy

Number of Enclaves

Medium

Time Needed to Inform All Employees

Medium

Making A Large Island

Hard

Find Mode in Binary Search Tree

Easy

Flip Equivalent Binary Trees

Medium

Maximum Depth of N-ary Tree

Easy

Convert Binary Search Tree to Sorted Doubly Linked List

Medium

Number of Good Leaf Nodes Pairs

Medium

Couples Holding Hands

Hard

Battleships in a Board

Medium

Smallest String Starting From Leaf

Medium

Employee Importance

Medium

Design Search Autocomplete System

Hard

Medium

Kth Ancestor of a Tree Node

Hard

Sort Items by Groups Respecting Dependencies

Hard

Water and Jug Problem

Medium

Binary Tree Coloring Game

Medium

Medium

Count Servers that Communicate

Medium

Longest Absolute File Path

Medium

Path With Maximum Minimum Value

Medium

Count Univalue Subtrees

Medium

Binary Tree Longest Consecutive Sequence II

Medium

Binary Tree Longest Consecutive Sequence

Medium

Serialize and Deserialize N-ary Tree

Hard

Find Elements in a Contaminated Binary Tree

Medium

Medium

Minimize Hamming Distance After Swap Operations

Medium

Frog Position After T Seconds

Hard

Escape a Large Maze

Hard

Cracking the Safe

Hard

Smallest Rectangle Enclosing Black Pixels

Hard

Hard

Find Root of N-Ary Tree

Medium

Medium

Tree of Coprimes

Hard

Correct a Binary Tree

Medium

Shortest Path in a Hidden Grid

Medium

Check If Two Expression Trees are Equivalent

Medium

Minimum Path Cost in a Hidden Grid

Medium

Change the Root of a Binary Tree

Medium

Move Sub-Tree of N-Ary Tree

Hard

Compiler Status

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