leetcode 49. Group Anagrams

class Solution {public:vector<vector<string>> groupAnagrams(vector<string>& strs){map<string, multiset<string>> map;for (auto s : strs){string t = s;sort(t.begin(), t.end());map[t].insert(s);}vector<vector<string>> res;for (auto g : map){res.push_back(vector<string>{g.second.begin(), g.second.end()});}return res;}};