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[Google] LeetCode 1554 Strings Differ by One Character 哈希
Given a list of strings dict where all the strings are of the same length. Return true if there are 2 strings that only differ by 1 character in the same index, otherwise return false. Solution 对于每个字符串，我们用哈希将其映射为数。然后对于每个位置（即删除的位