Day 8, pretty cool

src/main/kotlin/com/basdado/adventofcode/day8/Day8.kt

@@ -0,0 +1,55 @@
+package com.basdado.adventofcode.day8
+
+import com.basdado.adventofcode.line
+import java.util.concurrent.atomic.AtomicInteger
+import java.util.stream.Collectors
+
+
+const val DAY8_INPUT_PATH = "/day/8/input.txt"
+const val IMG_WIDTH = 25
+const val IMG_HEIGHT = 6
+
+
+fun main() {
+
+    Day8.puzzle1()
+    Day8.puzzle2()
+}
+
+object Day8 {
+
+    fun puzzle1() {
+
+        val counter = AtomicInteger()
+
+        val layer = line(DAY8_INPUT_PATH)
+            .chars()
+            .map { it - '0'.toInt() }
+            .mapToObj { it }
+            .collect(Collectors.groupingBy<Int, Int> { counter.getAndIncrement() / (IMG_WIDTH * IMG_HEIGHT) })
+            .minBy { it.value.stream().filter { n -> n == 0 }.count() }!!
+            .value
+
+        println(layer.count { it == 1 } * layer.count {  it == 2 })
+
+    }
+
+    fun puzzle2() {
+
+        val counter = AtomicInteger()
+
+        val img = line(DAY8_INPUT_PATH)
+            .chars()
+            .map { it - '0'.toInt() }
+            .mapToObj { it }
+            .collect(Collectors.groupingBy<Int, Int> { counter.getAndIncrement() % (IMG_WIDTH * IMG_HEIGHT) })
+            .map { it.value.firstOrNull { n -> n != 2 } }
+
+        for(i in 0 until IMG_HEIGHT) {
+            for (j in 0 until IMG_WIDTH) {
+                print(if(img[i * IMG_WIDTH + j] == 1) "#" else " ")
+            }
+            println()
+        }
+    }
+}