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Unique Email Addresses 用set点忽略，+后面忽略，@之后保存 class Solution { public: int numUniqueEmails(vector<string>& emails) { set<string> res; for(int i=0;i&a

Given an array A of strings, find any smallest string that contains each string in A as a substring. We may assume that no string in A is substring of another string in A. Example 1: Input: [“alex”,“l...