solve group anagrams

Author: sora0319

group-anagrams/sora0319.java

@@ -0,0 +1,27 @@
+class Solution {
+    public List<List<String>> groupAnagrams(String[] strs) {
+        Map<String, List<String>> groups = new HashMap<>();
+
+        for(String word : strs){
+            int[] characters = new int[26];
+            for(char c : word.toCharArray()){
+                characters[c - 'a']++;
+            }
+
+            String countCode = Arrays.toString(characters);
+            if(!groups.containsKey(countCode)){
+                groups.put(countCode, new ArrayList<String>());
+            }
+            List<String> temp = groups.get(countCode);
+            temp.add(word);
+        }
+
+        List<List<String>> answer = new ArrayList<>();
+        for(List<String> g : groups.values()){
+            answer.add(g);
+        }
+
+        return answer;
+    }
+}
+