Group Anagrams

Desicription

Given an array of strings, group anagrams together.

For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"],
Return:

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[
["ate", "eat","tea"],
["nat","tan"],
["bat"]
]

Note: All inputs will be in lower-case.

Solution

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