feat(2015-23): Initial

Author: angch

angch/2015-23/main.go

@@ -0,0 +1,86 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type instr struct {
+	op     string
+	param1 string
+	param2 int
+}
+
+func sim(instructions []instr, registers map[string]int) int {
+	for ip := 0; ip < len(instructions); ip++ {
+		op := instructions[ip]
+		// fmt.Println(ip, op, registers)
+		switch op.op {
+		case "hlf":
+			registers[op.param1] /= 2
+		case "tpl":
+			registers[op.param1] *= 3
+		case "inc":
+			registers[op.param1]++
+		case "jmp":
+			ip += op.param2 - 1
+		case "jie":
+			if registers[op.param1]%2 == 0 {
+				// fmt.Println("jumping")
+				ip += op.param2 - 1
+			}
+		case "jio":
+			// fmt.Println("j", op.param1, registers[op.param1], registers)
+			if registers[op.param1] == 1 {
+				// fmt.Println("jumping1")
+				ip += op.param2 - 1
+			}
+		}
+	}
+	return registers["b"]
+}
+func day22(file string) (int, int) {
+	part1, part2 := 0, 0
+	f, err := os.Open(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+
+	scanner := bufio.NewScanner(f)
+	instructions := []instr{}
+	for scanner.Scan() {
+		t := strings.ReplaceAll(scanner.Text(), ",", "")
+		words := strings.Split(t, " ")
+		switch words[0] {
+		case "inc", "tpl", "hlf":
+			instructions = append(instructions, instr{op: words[0], param1: words[1]})
+		case "jmp":
+			p, _ := strconv.Atoi(words[1])
+			instructions = append(instructions, instr{op: words[0], param2: p})
+		case "jie", "jio":
+			p, _ := strconv.Atoi(words[2])
+			instructions = append(instructions, instr{op: words[0], param1: words[1], param2: p})
+		}
+	}
+	fmt.Printf("%+v\n", instructions)
+
+	registers := map[string]int{"a": 0, "b": 0}
+	part1 = sim(instructions, registers)
+	registers = map[string]int{"a": 1, "b": 0}
+	part2 = sim(instructions, registers)
+
+	return part1, part2
+}
+
+func main() {
+	log.SetFlags(log.Lshortfile | log.LstdFlags)
+
+	part1, part2 := day22("test.txt")
+	fmt.Println(part1, part2)
+	fmt.Println(day22("input.txt"))
+}

angch/2015-23/test.txt

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