Leetcode Hot100 第47题 49.字母异位词分组

class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        unordered_map<string,vector<string>> hash;
        vector<vector<string>> res;
        for(string str:strs){
            string sort_str = str;
            sort(sort_str.begin(),sort_str.end());
            hash[sort_str].push_back(str);
        };
        for(auto it:hash){
            res.push_back(it.second);
        }
        return res;
    }
};