[ADD] Added day 17 solution

17/input.txt

@@ -0,0 +1,5 @@
+Register A: 64012472
+Register B: 0
+Register C: 0
+
+Program: 2,4,1,7,7,5,0,3,1,7,4,1,5,5,3,0

17/main.go

@@ -0,0 +1,309 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"math"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const FILE_PATH = "./input.txt"
+
+//const FILE_PATH = "./sample.txt"
+
+func LoadInput(filename string) ([]string, error) {
+	file, err := os.Open(filename)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var lines []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+
+	if err := scanner.Err(); err != nil {
+		return nil, err
+	}
+
+	return lines, nil
+}
+
+type ComputerParams struct {
+	startA  int
+	startB  int
+	startC  int
+	program []int
+}
+
+type structuredInput = ComputerParams
+
+func TransformInput(lines []string) structuredInput {
+	var startA int
+	var startB int
+	var startC int
+	var numb int
+	var numbs []string
+	var program = make([]int, 0)
+
+	startA, _ = strconv.Atoi(lines[0][len("Register A: "):])
+	startB, _ = strconv.Atoi(lines[1][len("Register B: "):])
+	startC, _ = strconv.Atoi(lines[2][len("Register C: "):])
+
+	numbs = strings.Split(lines[4][len("Program: "):], ",")
+
+	for _, temp := range numbs {
+		numb, _ = strconv.Atoi(temp)
+		program = append(program, numb)
+	}
+
+	return ComputerParams{startA, startB, startC, program}
+}
+
+type Program struct {
+	a int
+	b int
+	c int
+
+	i   int
+	out []int
+}
+
+const (
+	ADV = iota
+	BXL = iota
+	BST = iota
+	JNZ = iota
+	BXC = iota
+	OUT = iota
+	BDV = iota
+	CDV = iota
+)
+
+func getCombo(program Program, operand int) int {
+	if operand >= 0 && operand <= 3 {
+		return operand
+	}
+
+	if operand == 4 {
+		return program.a
+	}
+	if operand == 5 {
+		return program.b
+	}
+	if operand == 6 {
+		return program.c
+	}
+
+	return 0
+}
+
+func executeProgram(params ComputerParams) Program {
+	var program = Program{params.startA, params.startB, params.startC, 0, make([]int, 0)}
+	var opcode int
+	var operand int
+	var value int
+
+	for program.i < len(params.program) {
+		opcode = params.program[program.i]
+		operand = params.program[program.i+1]
+
+		switch opcode {
+		case ADV:
+			{
+				value = getCombo(program, operand)
+				program.a = int(float64(program.a) / math.Pow(2, float64(value)))
+				program.i += 2
+			}
+		case BXL:
+			{
+				program.b = program.b ^ operand
+				program.i += 2
+			}
+		case BST:
+			{
+				value = getCombo(program, operand)
+				program.b = value % 8
+				program.i += 2
+			}
+		case JNZ:
+			{
+				if program.a != 0 {
+					program.i = operand
+				} else {
+					program.i += 2
+				}
+			}
+		case BXC:
+			{
+				program.b = program.b ^ program.c
+				program.i += 2
+			}
+		case OUT:
+			{
+				program.out = append(program.out, getCombo(program, operand)%8)
+				program.i += 2
+			}
+		case BDV:
+			{
+				value = getCombo(program, operand)
+				program.b = int(float64(program.a) / math.Pow(2, float64(value)))
+				program.i += 2
+			}
+		case CDV:
+			{
+				value = getCombo(program, operand)
+				program.c = int(float64(program.a) / math.Pow(2, float64(value)))
+				program.i += 2
+			}
+		}
+	}
+
+	return program
+}
+
+func Part1(input structuredInput) int {
+	var result int = 0
+	input.startA = 265652340990877
+	var program = executeProgram(input)
+	for i := 0; i < len(program.out); i++ {
+		fmt.Printf("%d,", program.out[i])
+	}
+	fmt.Println()
+	return result
+}
+
+var numbs = [][]int{
+	[]int{0, 0, 0},
+	[]int{0, 0, 1},
+	[]int{0, 1, 0},
+	[]int{0, 1, 1},
+	[]int{1, 0, 0},
+	[]int{1, 0, 1},
+	[]int{1, 1, 0},
+	[]int{1, 1, 1},
+}
+
+func clone(input []int) []int {
+	var result = make([]int, len(input))
+
+	for i, numb := range input {
+		result[i] = numb
+	}
+
+	return result
+}
+
+func insert(numbers []int, numb []int, position int) ([]int, bool) {
+	var result = clone(numbers)
+	for i := 0; i < len(numb); i++ {
+		if position+i < 0 && numb[i] == 0 {
+			continue
+		}
+		if numbers[position+i] != -1 && numbers[position+i] != numb[i] {
+			return []int{}, true
+		}
+		result[position+i] = numb[i]
+	}
+	return result, false
+}
+
+func invs(is []int, should []int) []int {
+	var result = []int{0, 0, 0}
+
+	for i := 0; i < 3; i++ {
+		if should[i] == 1 && is[i] == 0 || should[i] == 0 && is[i] == 1 {
+			result[i] = 1
+		}
+	}
+
+	return result
+}
+
+func bToi(numbers []int) int {
+	var result = 0
+	var pow = math.Pow(2, float64(len(numbers)-1))
+	for i := 0; i < len(numbers); i++ {
+		result += numbers[i] * int(pow)
+		pow = pow / 2
+	}
+
+	return result
+}
+
+func Part2(input structuredInput) int {
+	var result int = 0
+	var poss [][]int = make([][]int, 1)
+	var next [][]int = make([][]int, 0)
+	var number []int = make([]int, 3*16)
+	var error bool
+	var position int
+	var temp []int
+	var work []int
+	for i := 0; i < len(number); i++ {
+		number[i] = -1
+	}
+
+	poss[0] = number
+
+	for j := 15; j >= 0; j-- {
+		next = make([][]int, 0)
+		for i := 0; i < len(poss); i++ {
+			work = poss[i]
+			position = j * 3
+			for m := 0; m < len(numbs); m++ {
+				temp, error = insert(work, numbs[m], position)
+				if error {
+					continue
+				}
+
+				temp, error = insert(temp, invs(numbs[m], numbs[input.program[len(input.program)-j-1]]), position-(7-m))
+				if error {
+					continue
+				}
+				next = append(next, temp)
+			}
+		}
+		poss = next
+	}
+
+	var lowest int = -1
+	var dec int
+	for i := 0; i < len(poss); i++ {
+		dec = bToi(poss[i])
+		if lowest == -1 || lowest > dec {
+			lowest = dec
+		}
+	}
+
+	result = lowest
+	return result
+}
+
+func main() {
+	var start time.Time
+	var elapsed time.Duration = 0
+	input, err := LoadInput(FILE_PATH)
+	if err != nil {
+		fmt.Println("Error loading input:", err)
+		return
+	}
+
+	structuredInput := TransformInput(input)
+	fmt.Println("Structured Input:", structuredInput)
+
+	start = time.Now()
+	fmt.Println("Solution Part 1: ", Part1(structuredInput))
+	elapsed = time.Since(start)
+	fmt.Printf("Part 1 took %s\n", elapsed)
+
+	start = time.Now()
+	fmt.Println("Solution Part 2: ", Part2(structuredInput))
+	elapsed = time.Since(start)
+	fmt.Printf("Part 2 took %s\n", elapsed)
+}

17/sample.txt

@@ -0,0 +1,5 @@
+Register A: 2024
+Register B: 0
+Register C: 0
+
+Program: 0,3,5,4,3,0