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https://leetcode.cn/problems/valid-square/description/

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个人思路：4个点两两各构造成6条边，其中有4条边相等，另外2条（斜边）相等，另外2条（斜边）比其他4条边长，可以按照直角三角形可计算斜边长度是否匹配Image Added

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