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.
\n\nGiven 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.
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Example 1:
\n\n\nInput: stones = [[0,0],[0,1],[1,0],[1,2],[2,1],[2,2]]\nOutput: 5\nExplanation: One way to remove 5 stones is as follows:\n1. Remove stone [2,2] because it shares the same row as [2,1].\n2. Remove stone [2,1] because it shares the same column as [0,1].\n3. Remove stone [1,2] because it shares the same row as [1,0].\n4. Remove stone [1,0] because it shares the same column as [0,0].\n5. Remove stone [0,1] because it shares the same row as [0,0].\nStone [0,0] cannot be removed since it does not share a row/column with another stone still on the plane.\n\n\n
Example 2:
\n\n\nInput: stones = [[0,0],[0,2],[1,1],[2,0],[2,2]]\nOutput: 3\nExplanation: One way to make 3 moves is as follows:\n1. Remove stone [2,2] because it shares the same row as [2,0].\n2. Remove stone [2,0] because it shares the same column as [0,0].\n3. Remove stone [0,2] because it shares the same row as [0,0].\nStones [0,0] and [1,1] cannot be removed since they do not share a row/column with another stone still on the plane.\n\n\n
Example 3:
\n\n\nInput: stones = [[0,0]]\nOutput: 0\nExplanation: [0,0] is the only stone on the plane, so you cannot remove it.\n\n\n
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Constraints:
\n\n1 <= stones.length <= 10000 <= xi, yi <= 104n 块石头放置在二维平面中的一些整数坐标点上。每个坐标点上最多只能有一块石头。
如果一块石头的 同行或者同列 上有其他石头存在，那么就可以移除这块石头。
\n\n给你一个长度为 n 的数组 stones ，其中 stones[i] = [xi, yi] 表示第 i 块石头的位置，返回 可以移除的石子 的最大数量。
\n\n
示例 1：
\n\n\n输入：stones = [[0,0],[0,1],[1,0],[1,2],[2,1],[2,2]]\n输出：5\n解释：一种移除 5 块石头的方法如下所示：\n1. 移除石头 [2,2] ，因为它和 [2,1] 同行。\n2. 移除石头 [2,1] ，因为它和 [0,1] 同列。\n3. 移除石头 [1,2] ，因为它和 [1,0] 同行。\n4. 移除石头 [1,0] ，因为它和 [0,0] 同列。\n5. 移除石头 [0,1] ，因为它和 [0,0] 同行。\n石头 [0,0] 不能移除，因为它没有与另一块石头同行/列。\n\n
示例 2：
\n\n\n输入：stones = [[0,0],[0,2],[1,1],[2,0],[2,2]]\n输出：3\n解释：一种移除 3 块石头的方法如下所示：\n1. 移除石头 [2,2] ，因为它和 [2,0] 同行。\n2. 移除石头 [2,0] ，因为它和 [0,0] 同列。\n3. 移除石头 [0,2] ，因为它和 [0,0] 同行。\n石头 [0,0] 和 [1,1] 不能移除，因为它们没有与另一块石头同行/列。\n\n
示例 3：
\n\n\n输入：stones = [[0,0]]\n输出：0\n解释：[0,0] 是平面上唯一一块石头，所以不可以移除它。\n\n
\n\n
提示：
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