complete 11057.kt 15835.kt 20411.kt 25345.kt 28242.kt 32628.kt

storage/zeta/kt/completed/11057.kt

@@ -0,0 +1,29 @@
+const val MOD = 10_007
+
+val MEMORY = Array<IntArray>(1003) { IntArray(10) { -1 } }
+
+fun countUprisingFrom(from: Int /*[0, 9]*/, length: Int): Int {
+    if (MEMORY[length][from] != -1) {
+        return MEMORY[length][from]
+    }
+    return if (length == 1) {
+        MEMORY[length][from] = 1
+        1
+    } else {
+        val s = (from..9).fold(0) { total, now ->
+            (total + countUprisingFrom(now, length - 1)) % MOD
+        }
+        MEMORY[length][from] = s
+        s
+    }
+}
+
+fun countTotalUprising(length: Int): Int {
+    return ((0..9).sumOf { countUprisingFrom(it, length) } % MOD)
+}
+
+
+fun main() {
+    val n = readln().toInt()
+    println(countTotalUprising(n))
+}