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花花酱 LeetCode 947. Most Stones Removed with Same Row or Column

Problem

On a 2D plane, we place stones at some integer coordinate points.  Each coordinate point may have at most one stone.

Now, a move consists of removing a stone that shares a column or row with another stone on the grid.

What is the largest possible number of moves we can make?

Example 1:

Input: stones = [[0,0],[0,1],[1,0],[1,2],[2,1],[2,2]]
Output: 5

Example 2:

Input: stones = [[0,0],[0,2],[1,1],[2,0],[2,2]]
Output: 3

Example 3:

Input: stones = [[0,0]]
Output: 0

Note:

  1. 1 <= stones.length <= 1000
  2. 0 <= stones[i][j] < 10000



Solution 2: Union Find

Find all connected components (islands)

Ans = # of stones – # of islands

C++

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