Number of Islands (Union-Find)
Medium📝 Description
Count number of islands in 2D grid using Union-Find
Input Format
[[0 or 1, ...], ...] (2D grid)
Output Format
integer
Constraints
m,n ≤ 300
🔍 Sample Input
[["1","1","0","0","0"],["1","1","0","0","0"],["0","0","1","0","0"],["0","0","0","1","1"]]
✅ Sample Output
3
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