Graph #01
Medium Number of Islands
Count how many connected land components appear in a binary grid.
Solved graphdfsconnected components
Graph
Connectivity, traversal, components, and graph state propagation. The focus here is DFS, BFS, and component thinking. Official LeetCode problems are linked on every page instead of being mirrored here.
1 published solutions
3 distinct tags
0 easy / 1 medium / 0 hard difficulty mix
May 21, 2026 most recently updated page
Problems
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Every page keeps the problem summary, recognition pattern, reasoning, pitfalls, and the exact C++ source used on the site.