Day 7

day7/part1.kts

@@ -0,0 +1,38 @@
+#!/usr/bin/env kotlin
+
+import java.io.File
+import java.time.Instant
+import java.util.*
+
+val start = Instant.now()
+
+val tests = File("./input.txt").readLines().map {
+    Pair(it.split(": ")[0], it.split(": ")[1])
+}.map {
+    Pair(it.first.toLong(), it.second.split(" ").map { n -> n.toLong() })
+}
+
+var finalResult = 0L
+
+tests.forEach { (test, values) ->
+    var results = LinkedList<Long>()
+    results.add(values[0])
+
+    for (i in 1..<values.size) {
+        val iter = results.listIterator();
+        while (iter.hasNext()) {
+            val result = iter.next()
+
+            iter.set(result * values[i])
+            iter.add(result + values[i])
+        }
+    }
+
+    if (test in results) {
+        finalResult += test
+    }
+}
+
+val time = (Instant.now().toEpochMilli() - start.toEpochMilli())
+
+println("Result: ${finalResult}\nTime: ${time}ms")

day7/part2.kts

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+#!/usr/bin/env kotlin
+
+import java.io.File
+import java.time.Instant
+import java.util.*
+import kotlin.math.*
+
+infix fun Long.`||`(other: Long)
+        = ((this * 10.0.pow(floor(log10(other.toDouble())) + 1)) + other).toLong()
+
+val start = Instant.now()
+
+val tests = File("./input.txt").readLines().map {
+    Pair(it.split(": ")[0], it.split(": ")[1])
+}.map {
+    Pair(it.first.toLong(), it.second.split(" ").map { n -> n.toLong() })
+}
+
+var finalResult = 0L
+
+tests.forEach { (test, values) ->
+    var results = LinkedList<Long>()
+    results.add(values[0])
+
+    for (i in 1..<values.size) {
+        val iter = results.listIterator();
+        while (iter.hasNext()) {
+            val result = iter.next()
+
+            iter.set(result * values[i])
+            iter.add(result + values[i])
+            iter.add(result `||` values[i])
+        }
+    }
+
+    if (test in results) {
+        finalResult += test
+    }
+}
+
+val time = (Instant.now().toEpochMilli() - start.toEpochMilli())
+
+println("Result: ${finalResult}\nTime: ${time}ms")