0947. Most Stones Removed with Same Row or Column

https://leetcode.com/problems/most-stones-removed-with-same-row-or-column

Description

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

A stone can be removed if it shares either the same row or the same column as another stone that has not been removed.

Given an array stones of length n where stones[i] = [xi, yi] represents the location of the ith stone, return the largest possible number of stones that can be removed.

Example 1:

**Input:** stones = [[0,0],[0,1],[1,0],[1,2],[2,1],[2,2]]
**Output:** 5
**Explanation:** One way to remove 5 stones is as follows:
1. Remove stone [2,2] because it shares the same row as [2,1].
2. Remove stone [2,1] because it shares the same column as [0,1].
3. Remove stone [1,2] because it shares the same row as [1,0].
4. Remove stone [1,0] because it shares the same column as [0,0].
5. Remove stone [0,1] because it shares the same row as [0,0].
Stone [0,0] cannot be removed since it does not share a row/column with another stone still on the plane.

Example 2:

**Input:** stones = [[0,0],[0,2],[1,1],[2,0],[2,2]]
**Output:** 3
**Explanation:** One way to make 3 moves is as follows:
1. Remove stone [2,2] because it shares the same row as [2,0].
2. Remove stone [2,0] because it shares the same column as [0,0].
3. Remove stone [0,2] because it shares the same row as [0,0].
Stones [0,0] and [1,1] cannot be removed since they do not share a row/column with another stone still on the plane.

Example 3:

**Input:** stones = [[0,0]]
**Output:** 0
**Explanation:** [0,0] is the only stone on the plane, so you cannot remove it.

Constraints:

• 1 <= stones.length <= 1000

• 0 <= xi, yi <= 104

• No two stones are at the same coordinate point.

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