diff --git a/src/8/12/group-anagrams.cpp b/src/8/12/group-anagrams.cpp
index 1286b9e..13ef38c 100644
--- a/src/8/12/group-anagrams.cpp
+++ b/src/8/12/group-anagrams.cpp
@@ -1,3 +1,6 @@
+#include <algorithm>
+#include <unordered_map>
+#include <utility>
 #include<vector>
 #include<string>
 using namespace std;
@@ -5,7 +8,17 @@ using namespace std;
 class Solution {
 public:
     vector<vector<string>> groupAnagrams(vector<string>& strs) {
-        
+        unordered_map<string, vector<string>> m;
+        for(int i=0;i<strs.size();i++){
+            string ns=strs[i];
+            sort(ns.begin(),ns.end());
+            m[ns].push_back(std::move(strs[i]));
+        }
+        vector<vector<string>> ans;
+        for(auto s :m){
+            ans.push_back(std::move(s.second));
+        }
+        return ans;
     }
 };