Solve part 1 day 9

Author: michaeltroger

src/Day9.kt

@@ -1,15 +1,44 @@
 private const val DAY = 9
 
 fun main() {
-    fun part1(input: List<String>) =-1
-    fun part2(input: List<String>) = -1
+    fun part1(input: List<List<Byte>>): Int {
+        var sum = 0
+        for (x in input.indices) {
+            for (y in input[0].indices) {
+                val currentHeight = input[x][y]
+                if (x > 0 && currentHeight >= input[x-1][y]) {
+                    continue
+                }
+                if (y > 0 && currentHeight >= input[x][y-1]) {
+                    continue
+                }
+                if (x < input.size - 1 && currentHeight >= input[x+1][y]) {
+                    continue
+                }
+                if (y < input[0].size - 1 && currentHeight >= input[x][y+1]) {
+                    continue
+                }
+                sum += currentHeight + 1
+            }
+        }
+        return sum
+    }
+    fun part2(input: List<List<Byte>>) = -1
 
     // test if implementation meets criteria from the description, like:
-    val testInput = readInput(day = DAY, useTestInput = true)
+    val testInput = parseInput(readInput(day = DAY, useTestInput = true))
     check(part1(testInput) == 15)
-    check(part2(testInput) == 61229)
+  //  check(part2(testInput) == 61229)
 
-    val input = readInput(day = DAY)
+    val input = parseInput(readInput(day = DAY))
     println(part1(input))
     println(part2(input))
+}
+
+private fun parseInput(input: List<String>): List<List<Byte>> {
+    return input.map {
+        it.map {
+            it.toString().toByte()
+        }
+    }
 }