95 lines
1.5 KiB
Go
95 lines
1.5 KiB
Go
package main
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import (
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"bufio"
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"fmt"
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"log"
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"os"
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"strconv"
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)
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func partOne() int {
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file, err := os.Open("input.txt")
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if err != nil {
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log.Fatalf("failed to open file: %s", err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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var startPos int = 50
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code := 0
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for scanner.Scan() {
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line := scanner.Text()
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dir := string(line[0])
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num, _ := strconv.Atoi(string(line[1:]))
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for num > 99 {
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num -= 100
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}
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switch dir {
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case "L":
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if (startPos - num) < 0 {
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startPos = 99 - (num - startPos - 1)
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} else {
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startPos -= num
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}
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case "R":
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if (startPos + num) > 99 {
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startPos = 0 + (num - (100 - startPos))
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} else {
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startPos += num
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}
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}
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if startPos == 0 {
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code++
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}
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}
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return code
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}
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func partTwo() int {
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file, err := os.Open("input.txt")
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if err != nil {
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log.Fatalf("failed to open file: %s", err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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var startPos int = 50
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code := 0
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for scanner.Scan() {
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line := scanner.Text()
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dir := string(line[0])
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num, _ := strconv.Atoi(string(line[1:]))
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for num > 99 {
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num -= 100
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code += 1
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}
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switch dir {
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case "L":
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for i := 0; i<num; i++ {
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startPos--
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if startPos < 0 {
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startPos = 99
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}
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if startPos == 0 {
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code++
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}
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}
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case "R":
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for i := 0; i<num; i++ {
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startPos++
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if startPos > 99 {
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startPos = 0
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}
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if startPos == 0 {
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code++
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}
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}
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}
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}
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return code
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}
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func main() {
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fmt.Println(partOne())
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fmt.Println(partTwo())
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}
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