GFG PTOD | 01 Jan 2025 | Problem Solved Successfully

vector<vector<string>> anagrams(vector<string>& arr) {
        // code here
        vector<vector<string>> ret;
        unordered_map<string, vector<string>> anagrams;
        
        for(int i=0; i<arr.size(); i++) {
            string key = arr[i];
            sort(key.begin(), key.end());
            anagrams[key].push_back(arr[i]);
        }
        
        for(auto x:anagrams) {
            ret.push_back(x.second);
        }
        return ret;
    }