0049. 字母异位词分组

// map
1049. 字母异位词分组

给定一个字符串数组，将字母异位词组合在一起。字母异位词指字母相同，但排列不同的字符串。

示例:

输入: ["eat", "tea", "tan", "ate", "nat", "bat"],
输出:
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]
说明：

所有输入均为小写字母。
不考虑答案输出的顺序。
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class Solution {
public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        map<string, vector<string> > mp;
        vector<vector<string> > ans;
        for(auto str : strs){
            string tmp = str;
            sort(tmp.begin(), tmp.end());
            mp[tmp].push_back(str);
        }
        for(auto i : mp){
            ans.push_back(i.second);
        }
        return ans;
    }
};