Merge pull request neetcode-gh#323 from confidencepm/patch-1

Update 49-Group-Anagrams.java

Author: neetcode-gh

java/49-Group-Anagrams.java

@@ -9,12 +9,10 @@ public List<List<String>> groupAnagrams(String[] strs) {
                 hash[c-'a']++;
             }
             String str=new String(hash);
-            if(map.get(str)==null){
-                map.put(str, new ArrayList<>());
-            }
+            map.computeIfAbsent(str, k -> new ArrayList<>());
             map.get(str).add(s);
         }
         res.addAll(map.values());
         return res;
     }
-}
+}