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- package main
- import (
- "fmt"
- "io/ioutil"
- "log"
- "os"
- "strconv"
- "strings"
- )
- func readInput(file string) []string {
- content, err := ioutil.ReadFile(file)
- if err != nil {
- log.Fatal(err)
- }
- lines := strings.Split(string(content), "\n")
- return lines
- }
- func part1(lines []string) int64 {
- var gamma []string
- var epsilon []string
- for i := 0; i < len(lines[0]); i++ {
- counts := []int{0, 0}
- for _, line := range lines {
- if line[i] == '0' {
- counts[0]++
- } else {
- counts[1]++
- }
- }
- if counts[0] > counts[1] {
- gamma = append(gamma, "0")
- epsilon = append(epsilon, "1")
- } else {
- gamma = append(gamma, "1")
- epsilon = append(epsilon, "0")
- }
- }
- gammaNumber, err := strconv.ParseInt(strings.Join(gamma, ""), 2, 64)
- if err != nil {
- log.Fatal(err)
- }
- epsilonNumber, err := strconv.ParseInt(strings.Join(epsilon, ""), 2, 64)
- if err != nil {
- log.Fatal(err)
- }
- return gammaNumber * epsilonNumber
- }
- func main() {
- if len(os.Args) < 2 {
- log.Fatal("You need to provide path to input file!")
- }
- lines := readInput(os.Args[1])
- fmt.Println(part1(lines))
- }
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