Method groupAnagrams

49. Group Anagrams/Solution.cpp:19–38

public:
    vector<vector<string>> groupAnagrams(vector<string>& strs) {
        vector<unsigned long> hash;
        vector<vector<string>> res;
        for (string str : strs) {
            unsigned s_hash = getHash(str);
            bool found = false;
            for (int i = 0; i < hash.size(); i ++) {
                if (hash[i] == s_hash) {
                    res[i].push_back(str);
                    found = true;
                    break;
                }
            }
            if (not found) {
                hash.push_back(s_hash);
                res.push_back({str});
            }
        }
        return res;
    }

    unsigned long getHash(string str) {
        int cnt[26] = {0};