d17

day17/d17p1.swift

@@ -0,0 +1,45 @@
+import Foundation
+
+/*
+0 adv: A / 2^OP -> A
+1 bxl: B xor LIT -> B
+2 bst: OP % 8 -> B
+3 jnz: jump LIT if A != 0
+4 bxc: B xor C -> B (ignore op/lit)
+5 out: OP % 8 -> screen
+6 bdv: A / 2^OP -> B
+7 cdv: A / 2^OP -> C
+
+adv 1 // A = A / 2
+out A // print(A % 8)
+jnz 0 // loop while A != 0
+
+
+2,4, 1,1, 7,5, 1,5, 4,0, 5,5, 0,3, 3,0
+bst 4 // B = A % 8
+bxl 1 // B = B xor 1
+cdv 5 // C = A / 2^B
+bxl 5 // B = B xor 5
+bxc 0 // B = B xor C
+out 5 // print(B % 8)
+adv 3 // A = A / 2^3
+jnz 0 // loop while A != 0
+*/
+
+// let prog = [2,4, 1,1, 7,5, 1,5, 4,0, 5,5, 0,3, 3,0]
+//var A = 164279024971709
+var A = 164279024971453
+var B = 0
+var C = 0
+
+while true {
+    B = A % 8  // 1
+    B = B ^ 1  // 2
+    C = A >> B // 3
+    B = B ^ 5  // 4
+    B = B ^ C  // 5
+    print(B % 8, terminator: ",")
+    A = A >> 3
+    if A == 0 { break }
+}
+