Initial commit

src/Day01.kt

@@ -0,0 +1,17 @@
+fun main() {
+    fun part1(input: List<String>): Int {
+        return input.size
+    }
+
+    fun part2(input: List<String>): Int {
+        return input.size
+    }
+
+    // test if implementation meets criteria from the description, like:
+    val testInput = readInput("Day01_test")
+    check(part1(testInput) == 1)
+
+    val input = readInput("Day01")
+    part1(input).println()
+    part2(input).println()
+}

src/Utils.kt

@@ -0,0 +1,21 @@
+import java.io.File
+import java.math.BigInteger
+import java.security.MessageDigest
+
+/**
+ * Reads lines from the given input txt file.
+ */
+fun readInput(name: String) = File("src", "$name.txt")
+    .readLines()
+
+/**
+ * Converts string to md5 hash.
+ */
+fun String.md5() = BigInteger(1, MessageDigest.getInstance("MD5").digest(toByteArray()))
+    .toString(16)
+    .padStart(32, '0')
+
+/**
+ * The cleaner shorthand for printing output.
+ */
+fun Any?.println() = println(this)