leetcode - Anagrams

leetcode - Anagrams

Given an array of strings, return all groups of strings that are anagrams.

Note: All inputs will be in lower-case.

class Solution {
public:
    std::vector anagrams(std::vector &strs) {
        std::vector res;
		std::map ans;
		for (int i = 0; i < strs.size(); i++)
		{
			std::string s = strs[i];
			std::sort(s.begin(),s.end());
			if(ans.find(s) != ans.end())
			{
				if(ans[s] >= 0)
				{
					res.push_back(strs[ans[s]]);
					ans[s] = -1;
				}
				res.push_back(strs[i]);
			}
			else
			{
				ans.insert(std::make_pair(s,i));
			}
		}
		return res;
    }
};