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

storage/zeta/kt/completed/20411.kt

@@ -0,0 +1,25 @@
+fun main() = with(System.`in`.bufferedReader()) {
+    val iter = this.readLine().split(" ").iterator()
+
+    val m = iter.next().toLong()
+    val seed = iter.next().toLong()
+    val x1 = iter.next().toLong()
+    val x2 = iter.next().toLong()
+
+    // x1 = (a * seed + c) % m
+    // x2 = (a * x1 + c) % m
+
+    (0 until m).asSequence().map { a ->
+        val t = (a * seed) % m
+        val c = if (t <= x1) {
+            x1 - t
+        } else {
+            m - (t - x1)
+        }
+        a to c
+    }.first { (a, c) ->
+        x2 == (a * x1 + c) % m
+    }.let { (a, c) ->
+        println("$a $c")
+    }
+}