day23

day23/day.go

@@ -0,0 +1,65 @@
+package day23
+
+import (
+	"strconv"
+	"strings"
+	"tools"
+)
+
+func run(code []string, registers map[string]int) {
+	instptr := 0
+
+	for instptr < len(code) {
+		instrparts := strings.Split(code[instptr], " ")
+		switch instrparts[0] {
+		case "hlf": // half a register
+			registers[instrparts[1]] /= 2
+			instptr++
+		case "tpl": // tripple a register
+			registers[instrparts[1]] *= 3
+			instptr++
+		case "inc": // increase register by 1
+			registers[instrparts[1]]++
+			instptr++
+		case "jmp": // jump to instruction
+			jumpamount, _ := strconv.Atoi(instrparts[1])
+			instptr += jumpamount
+		case "jie": // jump to instruction if register is even
+			if registers[string(instrparts[1][0])]%2 == 0 {
+				jumpamount, _ := strconv.Atoi(instrparts[2])
+				instptr += jumpamount
+			} else {
+				instptr++
+			}
+		case "jio": // jump to instruction if register is one
+			if registers[string(instrparts[1][0])] == 1 {
+				jumpamount, _ := strconv.Atoi(instrparts[2])
+				instptr += jumpamount
+			} else {
+				instptr++
+			}
+		}
+	}
+}
+
+func Part1(puzzle tools.AoCPuzzle) interface{} {
+	code := puzzle.GetInputArray()
+	registers := map[string]int{
+		"a": 0,
+		"b": 0,
+	}
+	run(code, registers)
+
+	return registers["b"]
+}
+
+func Part2(puzzle tools.AoCPuzzle) interface{} {
+	code := puzzle.GetInputArray()
+	registers := map[string]int{
+		"a": 1,
+		"b": 0,
+	}
+	run(code, registers)
+
+	return registers["b"]
+}

inputs/23

@@ -0,0 +1,47 @@
+jio a, +18
+inc a
+tpl a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+tpl a
+inc a
+jmp +22
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+inc a
+inc a
+tpl a
+jio a, +8
+inc b
+jie a, +4
+tpl a
+inc a
+jmp +2
+hlf a
+jmp -7

inputs/23_test

@@ -0,0 +1,4 @@
+inc a
+jio a, +2
+tpl a
+inc a

main.go

@@ -23,6 +23,7 @@ import (
 	"aoc2015/day20"
 	"aoc2015/day21"
 	"aoc2015/day22"
+	"aoc2015/day23"
 	"flag"
 	"fmt"
 	"os"
@@ -62,6 +63,7 @@ func initDayFunctions() {
 		20: {1: day20.Part1, 2: day20.Part2},
 		21: {1: day21.Part1, 2: day21.Part2},
 		22: {1: day22.Part1, 2: day22.Part2},
+		23: {1: day23.Part1, 2: day23.Part2},
 	}
 }