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leetcode 面试题08.08 有重复字符串的排列组合 C/C++ 排序 + 深度优先搜索(分支限界)

#include<iostream>#include<algorithm>#include<vector>using namespace std;class Solution {public: vector<string> permutation(string S) { sort(S.begin(),S.end()); vector<string> retVec; vector<int>