Bug fix: Defined as char however should be int

There was a small typo on Line 8 defining the array as char instead of int. This resulted in a permanent blank array as the ++ increment is an integer value and couldn't be stored.

Author: OfficialTomJ

Diff for: java/0049-group-anagrams.java

@@ -5,11 +5,11 @@ public List<List<String>> groupAnagrams(String[] strs) {
         if (strs.length == 0) return res;
         HashMap<String, List<String>> map = new HashMap<>();
         for (String s : strs) {
-            char[] hash = new char[26];
+            int[] hash = new int[26];
             for (char c : s.toCharArray()) {
                 hash[c - 'a']++;
             }
-            String key = new String(hash);
+            String key = new String(Arrays.toString(hash));
             map.computeIfAbsent(key, k -> new ArrayList<>());
             map.get(key).add(s);
         }