#include "leetcode.h" class Solution { public: vvd(string) groupAnagrams(vector &strs) { map, vector> groups; for (string s : strs) { array hash = {0}; for (char c : s) ++hash[c - 'a']; groups[hash].push_back(s); } vvd(string) ans; for (auto [hash, group] : groups) ans.push_back(group); return ans; } };