LeetCode 49. 字母异位词分组

class Solution {
public:
    unordered_map<string, vector<string>>h;
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        vector<vector<string>>res;
        for(auto &x:strs){
            string cur=x;
            sort(cur.begin(),cur.end());
            h[cur].push_back(x);
        }
        for(auto it=h.begin();it!=h.end();++it)
            res.push_back(it->second);
        return res;
    }
};