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Number of Islands
MEDIUM
Course Schedule
MEDIUM
Binary Tree Level Order Traversal
MEDIUM
Symmetric Tree
EASY
Invert Binary Tree
EASY
Rotting Oranges
MEDIUM
Word Ladder
HARD
Binary Tree Right Side View
MEDIUM
Same Tree
EASY
Perfect Squares
MEDIUM
All Nodes Distance K in Binary Tree
MEDIUM
Binary Tree Zigzag Level Order Traversal
MEDIUM
Course Schedule II
MEDIUM
Serialize and Deserialize Binary Tree
HARD
Max Area of Island
MEDIUM
Populating Next Right Pointers in Each Node
MEDIUM
Clone Graph
MEDIUM
Evaluate Division
MEDIUM
Longest Increasing Path in a Matrix
HARD
Surrounded Regions
MEDIUM
Merge Two Binary Trees
EASY
Flood Fill
EASY
Pacific Atlantic Water Flow
MEDIUM
Minimum Depth of Binary Tree
EASY
Accounts Merge
MEDIUM
Shortest Path in Binary Matrix
MEDIUM
Word Ladder II
HARD
Path With Minimum Effort
MEDIUM
Remove Invalid Parentheses
HARD
Shortest Bridge
MEDIUM
Binary Tree Level Order Traversal II
MEDIUM
Deepest Leaves Sum
MEDIUM
Possible Bipartition
MEDIUM
Shortest Path in a Grid with Obstacles Elimination
HARD
Number of Closed Islands
MEDIUM
Alien Dictionary
HARD
Minimum Absolute Difference in BST
EASY
Shortest Path Visiting All Nodes
HARD
Number of Enclaves
MEDIUM
As Far from Land as Possible
MEDIUM
Time Needed to Inform All Employees
MEDIUM
Making A Large Island
HARD
Trapping Rain Water II
HARD
Jump Game IV
HARD
Graph Valid Tree
MEDIUM
Walls and Gates
MEDIUM
Maximum Depth of N-ary Tree
EASY
Couples Holding Hands
HARD
Employee Importance
MEDIUM
Minesweeper
MEDIUM
Kth Ancestor of a Tree Node
HARD
Shortest Distance from All Buildings
HARD
Minimum Cost to Make at Least One Valid Path in a Grid
HARD
Sort Items by Groups Respecting Dependencies
HARD
Water and Jug Problem
MEDIUM
Minimum Knight Moves
MEDIUM
The Maze II
MEDIUM
Count Servers that Communicate
MEDIUM
Path With Maximum Minimum Value
MEDIUM
Serialize and Deserialize N-ary Tree
HARD
Find Elements in a Contaminated Binary Tree
MEDIUM
Minimum Number of Flips to Convert Binary Matrix to Zero Matrix
HARD
Tree Diameter
MEDIUM
Map of Highest Peak
MEDIUM
Frog Position After T Seconds
HARD
Escape a Large Maze
HARD
Brace Expansion
MEDIUM
Smallest Rectangle Enclosing Black Pixels
HARD
The Maze III
HARD
Brace Expansion II
HARD
Find Nearest Right Node in Binary Tree
MEDIUM
Correct a Binary Tree
MEDIUM
Shortest Path in a Hidden Grid
MEDIUM
Minimum Path Cost in a Hidden Grid
MEDIUM