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Practice Problems
Reinforce Your Learning
Practice these depth-first search problems to strengthen your understanding of DFS concepts.
Difficulty Levels:
EasyMediumHard
Filter by Difficulty:
Problem of the Day
Number of Islands
MediumCount the number of islands in a 2D grid.
Input: Example input
Output: Example output
All Problems
Number of Islands
DFS, BFS, Matrix
Course Schedule
DFS, Graph, Topological Sort
Clone Graph
DFS, BFS, Graph
Pacific Atlantic Water Flow
DFS, BFS, Matrix
Surrounded Regions
DFS, BFS, Matrix
N-Queens
DFS, Backtracking
Sudoku Solver
DFS, Backtracking
Word Search
DFS, Backtracking, Matrix
Graph Valid Tree
DFS, BFS, Graph
Critical Connections in a Network
DFS, Graph, Tarjan's Algorithm
Practice Makes Perfect
Solidify your understanding of depth-first search by solving these carefully selected problems.
Depth-First Search Problems
Filter by Difficulty:
Filter by Difficulty:
Number of Islands
DFS, BFS, Matrix
Course Schedule
DFS, Graph, Topological Sort
Clone Graph
DFS, BFS, Graph
Pacific Atlantic Water Flow
DFS, BFS, Matrix
Surrounded Regions
DFS, BFS, Matrix
N-Queens
DFS, Backtracking
Sudoku Solver
DFS, Backtracking
Word Search
DFS, Backtracking, Matrix
Graph Valid Tree
DFS, BFS, Graph
Critical Connections in a Network
DFS, Graph, Tarjan's Algorithm
Problem of the Day
Problem of the Day
Number of Islands
MediumCount the number of islands in a 2D grid.
Input: Example input
Output: Example output
Your Progress
Your Progress
Complete your first problem to start tracking progress
Easy
0/0
Medium
0/7
Hard
0/3
Total
0/10
Next Steps
After practicing depth-first search problems, explore these related topics: