49. Group Anagrams

hashmap题，挺简单的

class Solution {public:    vector<vector<string>> groupAnagrams(vector<string>& strs) {        map<string,vector<string>> func;        for(int i=0;i<strs.size();i++)        {            string origin=strs[i];            sort(strs[i].begin(),strs[i].end());            func[strs[i]].push_back(origin);        }        vector<vector<string>> result;        for(map<string,vector<string>>::iterator it=func.begin();it!=func.end();it++)            result.push_back(it->second);        return result;    }};