161 lines
3.1 KiB
Go
161 lines
3.1 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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)
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const FILE_PATH = "./input.txt"
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//const FILE_PATH = "./sample.txt"
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func LoadInput(filename string) ([]string, error) {
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file, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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var lines []string
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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lines = append(lines, scanner.Text())
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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return lines, nil
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}
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type Calculation struct {
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solution int
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numbs []int
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}
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type structuredInput = []Calculation
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func TransformInput(lines []string) structuredInput {
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var result = make([]Calculation, 0)
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var temp []string
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var solution int
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var numbs []int
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var numb int
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for _, line := range lines {
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numbs = make([]int, 0)
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temp = strings.Split(line, ": ")
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solution, _ = strconv.Atoi(temp[0])
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temp = strings.Split(temp[1], " ")
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for _, snumb := range temp {
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numb, _ = strconv.Atoi(snumb)
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numbs = append(numbs, numb)
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}
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result = append(result, Calculation{solution, numbs})
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}
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return result
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}
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func RekursiveSolverPart1(result int, index int, calc Calculation) bool {
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if result > calc.solution {
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return false
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}
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if index == len(calc.numbs)-1 {
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return result == calc.solution
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}
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if RekursiveSolverPart1(result+calc.numbs[index+1], index+1, calc) {
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return true
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}
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return RekursiveSolverPart1(result*calc.numbs[index+1], index+1, calc)
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}
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func CalculateCalibrationResultPart1(calc Calculation) int {
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if RekursiveSolverPart1(calc.numbs[0], 0, calc) {
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return calc.solution
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}
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return 0
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}
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func Part1(input structuredInput) int {
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var result = 0
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for _, calc := range input {
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result += CalculateCalibrationResultPart1(calc)
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}
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return result
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}
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var temp int
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func RekursiveSolverPart2(result int, index int, calc Calculation) bool {
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if result > calc.solution {
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return false
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}
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if index == len(calc.numbs)-1 {
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return result == calc.solution
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}
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if RekursiveSolverPart2(result+calc.numbs[index+1], index+1, calc) {
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return true
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}
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if RekursiveSolverPart2(result*calc.numbs[index+1], index+1, calc) {
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return true
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}
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temp, _ = strconv.Atoi(strconv.Itoa(result) + strconv.Itoa(calc.numbs[index+1]))
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return RekursiveSolverPart2(temp, index+1, calc)
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}
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func CalculateCalibrationResultPart2(calc Calculation) int {
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if RekursiveSolverPart2(calc.numbs[0], 0, calc) {
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return calc.solution
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}
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return 0
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}
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func Part2(input structuredInput) int {
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var result = 0
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for _, calc := range input {
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result += CalculateCalibrationResultPart2(calc)
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}
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return result
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}
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func main() {
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var start time.Time
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var elapsed time.Duration = 0
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input, err := LoadInput(FILE_PATH)
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if err != nil {
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fmt.Println("Error loading input:", err)
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return
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}
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structuredInput := TransformInput(input)
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fmt.Println("Structured Input:", structuredInput)
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start = time.Now()
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fmt.Println("Solution Part 1: ", Part1(structuredInput))
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elapsed = time.Since(start)
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fmt.Printf("Part 1 took %s\n", elapsed)
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start = time.Now()
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fmt.Println("Solution Part 2: ", Part2(structuredInput))
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elapsed = time.Since(start)
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fmt.Printf("Part 2 took %s\n", elapsed)
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}
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