group anagrams solution

Author: JeonJe

group-anagrams/JeonJe.java

@@ -0,0 +1,24 @@
+import java.util.*;
+
+// TC: O(n * k log k)
+// SC: O(n * k)
+class Solution {
+    public List<List<String>> groupAnagrams(String[] strs) {
+        List<List<String>> answer = new ArrayList<>();
+        Map<String, List<String>> map = new HashMap<>();
+
+        for (String str : strs) {
+            char[] charArray = str.toCharArray();
+            Arrays.sort(charArray);
+            String sortedStr = String.valueOf(charArray);
+
+            map.computeIfAbsent(sortedStr, k -> new ArrayList<>()).add(str);
+        }
+
+        for (String s : map.keySet()) {
+            answer.add(map.get(s));
+        }
+
+        return answer;
+    }
+}