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package main
import (
"bufio"
"fmt"
"os"
)
func main() {
fmt.Println(part1(readData("example.txt")), 3)
fmt.Println(part1(readData("data.txt")), 3)
}
type Data struct {
keys [][5]int
locks [][5]int
}
func fits(k, l [5]int) bool {
for i := range k {
if k[i]+l[i] > 5 {
return false
}
}
return true
}
func part1(data Data) (count int) {
for _, k := range data.keys {
for _, l := range data.locks {
if fits(k, l) {
count++
}
}
}
return
}
func readData(fileName string) (data Data) {
data = Data{}
fp, _ := os.Open(fileName)
scanner := bufio.NewScanner(fp)
for scanner.Scan() {
isKey := scanner.Text()[0] == '.'
code := [5]int{0, 0, 0, 0, 0}
for i := 0; scanner.Scan() && i < 5; i++ {
line := scanner.Text()
for j := range 5 {
if line[j] == '#' {
code[j]++
}
}
}
scanner.Scan()
if isKey {
data.keys = append(data.keys, code)
} else {
data.locks = append(data.locks, code)
}
}
return
}
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