2022-06-20 update: added "Group Anagrams"

Author: fartem

src/main/java/com/smlnskgmail/jaman/leetcodejava/medium/GroupAnagrams.java

@@ -0,0 +1,38 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import java.util.*;
+
+// https://leetcode.com/problems/group-anagrams/
+public class GroupAnagrams {
+
+    private final String[] input;
+
+    public GroupAnagrams(String[] input) {
+        this.input = input;
+    }
+
+    public List<List<String>> solution() {
+        Map<String, List<String>> values = new HashMap<>();
+        for (String str : input) {
+            char[] key = new char[str.length()];
+            for (int i = 0; i < str.length(); i++) {
+                key[i] = str.charAt(i);
+            }
+            Arrays.sort(key);
+            String k = String.valueOf(key);
+            if (values.containsKey(k)) {
+                values.get(k).add(str);
+            } else {
+                List<String> value = new ArrayList<>();
+                value.add(str);
+                values.put(k, value);
+            }
+        }
+        List<List<String>> result = new ArrayList<>();
+        for (Map.Entry<String, List<String>> value : values.entrySet()) {
+            result.add(value.getValue());
+        }
+        return result;
+    }
+
+}

src/test/java/com/smlnskgmail/jaman/leetcodejava/medium/GroupAnagramsTest.java

@@ -0,0 +1,19 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class GroupAnagramsTest {
+
+    @Test
+    public void defaultTest() {
+        assertEquals(
+                List.of(List.of("eat", "tea", "ate"), List.of("bat"), List.of("tan", "nat")),
+                new GroupAnagrams(new String[]{"eat", "tea", "tan", "ate", "nat", "bat"}).solution()
+        );
+    }
+
+}