/
main.go
60 lines (51 loc) · 809 Bytes
/
main.go
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package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path"
)
func input() *os.File {
input, err := os.Open(path.Join("2020", "6", "input.txt"))
if err != nil {
panic(err)
}
return input
}
func solve(r io.Reader) {
raw, err := ioutil.ReadAll(r)
if err != nil {
panic(err)
}
rows := bytes.Split(raw, []byte{'\r', '\n'})
total := 0
counter := 0
answered := make(map[byte]int)
for _, row := range rows {
if len(row) == 0 {
for _, v := range answered {
if v == counter {
total += 1
}
}
counter = 0
answered = make(map[byte]int)
continue
}
counter += 1
for i := 0; i < len(row); i++ {
answered[row[i]] += 1
}
}
for _, v := range answered {
if v == counter {
total += 1
}
}
fmt.Println(total)
}
func main() {
solve(input())
}