Day 8 part 1

main.go

@@ -27,6 +27,9 @@ func main() {
 
 	runAndBenchmark("07", "1", false, solutions.Day07Part01)
 	runAndBenchmark("07", "2", false, solutions.Day07Part02)
+
+	runAndBenchmark("08", "1", false, solutions.Day08Part01)
+	runAndBenchmark("08", "2", true, solutions.Day08Part02)
 }
 
 type execute func(bool) int

solutions/day08.go

@@ -0,0 +1,90 @@
+package solutions
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type InstructionStore struct {
+	instruction    Instruction
+	value          int
+	executionCount int
+}
+
+type Instruction int
+
+const (
+	nop Instruction = iota
+	acc
+	jmp
+)
+
+func parseInstruction(line string) (Instruction, int) {
+	instr := strings.Split(line, " ")[0]
+	valueStr := line[4:]
+	value, err := strconv.Atoi(valueStr)
+	if err != nil {
+		fmt.Println(err)
+		panic("expected a number, got `" + valueStr + "`")
+	}
+
+	var instruction Instruction
+
+	if instr == "nop" {
+		instruction = nop
+	} else if instr == "acc" {
+		instruction = acc
+	} else if instr == "jmp" {
+		instruction = jmp
+	} else {
+		panic("Invalid instruction found: " + instr)
+	}
+
+	return instruction, value
+}
+
+func Day08Part01(isTest bool) int {
+	input := ReadInput("08", isTest)
+	groups := strings.Split(input, "\n")
+
+	instructionArray := make([]*InstructionStore, len(groups))
+
+	for idx, line := range groups {
+		instr, value := parseInstruction(line)
+		instructionArray[idx] = &InstructionStore{instruction: instr, value: value, executionCount: 0}
+	}
+
+	accumulator := 0
+	instructionPointer := 0
+
+	for {
+		currentInstruction := instructionArray[instructionPointer]
+		inst := currentInstruction.instruction
+		value := currentInstruction.value
+		executionCount := currentInstruction.executionCount
+
+		if executionCount != 0 {
+			return accumulator
+		}
+
+		switch inst {
+		case nop:
+			currentInstruction.executionCount += 1
+			instructionPointer += 1
+		case acc:
+			currentInstruction.executionCount += 1
+			accumulator += value
+			instructionPointer += 1
+		case jmp:
+			currentInstruction.executionCount += 1
+			instructionPointer += value
+		default:
+			panic("Found an invalid instruction while trying to execute it. " + strconv.Itoa(int(inst)))
+		}
+	}
+}
+
+func Day08Part02(isTest bool) int {
+	return -1
+}