1157(A,kt): solve “Reachable Numbers”

Signed-off-by: Matej Focko <me@mfocko.xyz>

1157/A.kt

@@ -0,0 +1,23 @@
+//import readInt
+
+fun removeTrailingZeros(n: Int): Int =
+    if (n % 10 == 0)
+        removeTrailingZeros(n / 10)
+    else
+        n
+
+fun f(n: Int): Int = removeTrailingZeros(n + 1)
+
+fun findReachable(n: Int): Int {
+    val reachable = mutableSetOf<Int>()
+    var m = n
+
+    while (reachable.add(m)) m = f(m)
+
+    return reachable.size
+}
+
+fun main() {
+    val n = readLine()!!.toInt()
+    println(findReachable(n))
+}