diff --git a/problems/unique-morse-code-words.kt b/problems/unique-morse-code-words.kt
new file mode 100644
index 0000000..e65bf97
--- /dev/null
+++ b/problems/unique-morse-code-words.kt
@@ -0,0 +1,47 @@
+class Solution {
+    val mapping = arrayOf(
+        ".-",
+        "-...",
+        "-.-.",
+        "-..",
+        ".",
+        "..-.",
+        "--.",
+        "....",
+        "..",
+        ".---",
+        "-.-",
+        ".-..",
+        "--",
+        "-.",
+        "---",
+        ".--.",
+        "--.-",
+        ".-.",
+        "...",
+        "-",
+        "..-",
+        "...-",
+        ".--",
+        "-..-",
+        "-.--",
+        "--.."
+    )
+
+    private fun charToMorse(c: Char): String = mapping[c - 'a']
+
+    fun uniqueMorseRepresentations(words: Array<String>): Int =
+        words
+            .map { word ->
+                word.map { charToMorse(it) }.joinToString(separator = "")
+            }
+            .toSet()
+            .size
+}
+
+fun main() {
+    val s = Solution()
+
+    check(s.uniqueMorseRepresentations(arrayOf("gin", "zen", "gig", "msg")) == 2)
+    check(s.uniqueMorseRepresentations(arrayOf("a")) == 1)
+}