advent-of-code/solutions/2/go/main.go

78 lines
1.5 KiB
Go
Raw Normal View History

2020-12-04 19:45:03 +01:00
package main
import (
"fmt"
"io/ioutil"
"strconv"
"strings"
)
type sRow struct {
min, max int
char, password string
}
func parse(data []byte) []sRow {
parsed := []sRow{}
for _, row := range strings.Split(strings.TrimSpace(string(data)), "\n") {
s0 := strings.Split(row, ":")
rule := strings.TrimSpace(s0[0])
password := strings.TrimSpace(s0[1])
s1 := strings.Split(rule, " ")
minMax := strings.TrimSpace(s1[0])
char := strings.TrimSpace(s1[1])
s2 := strings.Split(minMax, "-")
min, _ := strconv.Atoi(strings.TrimSpace(s2[0]))
max, _ := strconv.Atoi(strings.TrimSpace(s2[1]))
r := sRow{
min: min,
max: max,
char: char,
password: password,
}
parsed = append(parsed, r)
}
return parsed
}
func validSimple(rows []sRow) int {
valid := 0
for _, row := range rows {
count := strings.Count(row.password, row.char)
if row.min <= count && count <= row.max {
valid++
}
}
return valid
}
func validComplex(rows []sRow) int {
valid := 0
for _, row := range rows {
l := len(row.password)
min := row.min - 1
max := row.max - 1
if min >= l || max >= l {
continue
}
r := []rune(row.password)
a := string(r[min]) == row.char
b := string(r[max]) == row.char
if a != b {
valid++
}
}
return valid
}
func main() {
data, _ := ioutil.ReadFile("./solutions/2/data.txt")
rows := parse(data)
simple := validSimple(rows)
fmt.Println(simple)
complex := validComplex(rows)
fmt.Println(complex)
}