Merge pull request neetcode-gh#608 from sharansalian/main

Add 49-Group-Anagrams.kt

Author: Ahmad-A0

kotlin/49-Group-Anagrams.kt

@@ -0,0 +1,25 @@
+package kotlin
+
+fun main() {
+
+    val strs = arrayOf("eat", "tea", "tan", "ate", "nat", "bat")
+
+    println(groupAnagrams(strs))
+}
+
+fun groupAnagrams(strs: Array<String>): List<List<String>> {
+    val res: HashMap<String, MutableList<String>> = hashMapOf()
+
+    for (s in strs){
+        val count = IntArray(26)
+
+        for (c in s){
+            val index = c - 'a'
+            count[index] += 1
+        }
+
+        res[count.joinToString()] = res.getOrDefault(count.joinToString(), mutableListOf()).also { it.add(s) }
+    }
+
+    return res.values.toList()
+}