Day20260222#

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 vector<vector<string>> groupAnagrams(vector<string>& strs) {
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        unordered_map<string,vector<string> > table;
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        for(string str : strs){
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            string tmp = str;
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            sort(tmp.begin(),tmp.end());
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            table[tmp].push_back(str);
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        }
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        vector<vector<string> > ans;
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        for(auto item : table){
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            ans.push_back(item.second);
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        }
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        return ans;
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 }