Day02 part2 対応中

src/Day02.kt

@@ -1,21 +1,25 @@
 fun main() {
-    fun checkNumber(list: List<Int>): Boolean {
-        if (list == list.sorted() || list == list.sortedDescending()) {
-            val isUp = if (list[0] < list[1]) true else false
-            if (isUp) {
-                for (i in 0..<list.lastIndex) {
-                    val delta = list[i + 1] - list[i]
-                    if (delta < 1 || 3 < delta ) return false
+    fun checkNumber(list: List<Int>, alreadyUnsafe:Boolean): Boolean {
+        var unsafe = alreadyUnsafe
+        val isUp = if (list[0] < list[1]) true else false
+        if (isUp) {
+            for (i in 0..<list.lastIndex) {
+                val delta = list[i + 1] - list[i]
+                if (delta < 1 || 3 < delta) {
+                    if (unsafe) return false
+                    unsafe = true
                 }
-            } else {
-                for (i in 0..<list.lastIndex) {
-                    val delta = list[i] - list[i + 1]
-                    if (delta < 1 || 3 < delta ) return false
+            }
+        } else {
+            for (i in 0..<list.lastIndex) {
+                val delta = list[i] - list[i + 1]
+                if (delta < 1 || 3 < delta) {
+                    if (unsafe) return false
+                    unsafe = true
                 }
             }
-            return true
         }
-        return false
+        return true
     }
 
     /**
@@ -26,21 +30,26 @@ fun main() {
         var safe = 0
         input.forEach { row ->
             var values = row.split(" ").map { it.toInt() }
-            if (checkNumber(values)) safe++
+            if (checkNumber(values, true)) safe++
         }
         return safe
     }
 
 
     fun part2(input: List<String>): Int {
-
-        return 0
+        // safeなリストの数
+        var safe = 0
+        input.forEach { row ->
+            var values = row.split(" ").map { it.toInt() }
+            if (checkNumber(values, false)) safe++
+        }
+        return safe
     }
 
 
-//    val input = readInput("Day02_test")
-    val input = readInput("Day02")
+    val input = readInput("Day02_test")
+//    val input = readInput("Day02")
 
-    part1(input).println()
-//    part2(input).println()
+//    part1(input).println()
+    part2(input).println()
 }