83 lines
1.7 KiB
Go
83 lines
1.7 KiB
Go
package main
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import (
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"fmt"
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"log"
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"os"
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"strconv"
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"strings"
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)
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func parseInput(file string) []string {
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content, err := os.ReadFile(file)
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if err != nil {
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log.Fatalf("Failed to read input file: %v", err)
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}
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lines := strings.Split(string(content), "\n")
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var data []string
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for _, line := range lines {
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data = append(data, line)
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}
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return data
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}
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func PartOne(data []string) int {
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valid := 0
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for _, line := range data {
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if line == "" {
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continue
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}
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parts := strings.Split(line, ": ")
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policy := parts[0]
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password := parts[1]
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policyParts := strings.Split(policy, " ")
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rangeStr := policyParts[0]
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letter := policyParts[1]
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rangeParts := strings.Split(rangeStr, "-")
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min, _ := strconv.Atoi(rangeParts[0])
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max, _ := strconv.Atoi(rangeParts[1])
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count := strings.Count(password, letter)
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if count >= min && count <= max {
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valid++
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}
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}
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return valid
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}
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func PartTwo(data []string) int {
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valid := 0
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for _, line := range data {
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if line == "" {
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continue
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}
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parts := strings.Split(line, ": ")
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policy := parts[0]
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password := parts[1]
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policyParts := strings.Split(policy, " ")
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rangeStr := policyParts[0]
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letter := policyParts[1]
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rangeParts := strings.Split(rangeStr, "-")
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firstPosition, _ := strconv.Atoi(rangeParts[0])
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secondPosition, _ := strconv.Atoi(rangeParts[1])
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atFirstPosition := len(password) >= firstPosition && password[firstPosition-1] == letter[0]
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atSecondPosition := len(password) >= secondPosition && password[secondPosition-1] == letter[0]
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if atFirstPosition != atSecondPosition {
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valid++
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}
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}
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return valid
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}
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func main() {
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data := parseInput("input.txt")
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fmt.Println("Part 1:", PartOne(data))
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fmt.Println("Part 2:", PartTwo(data))
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}
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