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|
package main
import (
"bufio"
"fmt"
"os"
"git.adyxax.org/aoc/2021/05/line"
)
func abs(a int) int {
if a < 0 {
return -a
}
return a
}
func computeDelta(a, b int) int {
if a < b {
return 1
} else if a > b {
return -1
}
return 0
}
func main() {
matrix := make([][]int, 1000)
for i := 0; i < 1000; i++ {
matrix[i] = make([]int, 1000)
}
parser := line.NewParser(bufio.NewReader(os.Stdin))
for {
l, err := parser.Parse()
if err != nil {
break
}
length := abs(l.X2 - l.X1)
if length == 0 {
length = abs(l.Y2 - l.Y1)
}
dx := computeDelta(l.X1, l.X2)
dy := computeDelta(l.Y1, l.Y2)
if dx == 0 || dy == 0 {
for i := 0; i <= length; i++ {
matrix[l.X1+i*dx][l.Y1+i*dy]++
}
}
}
score := 0
for i := 0; i < 1000; i++ {
for j := 0; j < 1000; j++ {
if matrix[i][j] >= 2 {
score++
}
}
}
fmt.Println(score)
}
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