Solution for "Group Anagrams"

Author: Thuy Trinh

src/main/java/leetcode/groupanagrams/Solution.kt

@@ -0,0 +1,18 @@
+package leetcode.groupanagrams
+
+/**
+ * https://leetcode.com/problems/group-anagrams/description/
+ */
+class Solution {
+  fun groupAnagrams(strs: Array<String>): List<List<String>> {
+    val map = mutableMapOf<List<Char>, MutableList<String>>()
+    strs.forEach {
+      val v = map.getOrPut(it.toList().sorted()) {
+        mutableListOf()
+      }
+      v += it
+    }
+    return map.values
+        .map { it.sorted() }
+  }
+}

src/main/java/leetcode/lettercombinations/Solution.kt

@@ -2,6 +2,9 @@ package leetcode.lettercombinations
 
 import java.util.*
 
+/**
+ * https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/
+ */
 class Solution {
   private val kb = hashMapOf(
       '1' to "",

src/test/java/leetcode/groupanagrams/SolutionTest.kt

@@ -0,0 +1,16 @@
+package leetcode.groupanagrams
+
+import org.amshove.kluent.shouldContainAll
+import org.junit.Test
+
+class SolutionTest {
+  @Test
+  fun groupAnagrams() {
+    Solution().groupAnagrams(arrayOf("eat", "tea", "tan", "ate", "nat", "bat"))
+        .shouldContainAll(listOf(
+            listOf("ate", "eat", "tea"),
+            listOf("nat", "tan"),
+            listOf("bat")
+        ))
+  }
+}