advent-of-code/2021/17/second.go

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package main
import (
"bufio"
"fmt"
"os"
"strconv"
"strings"
)
type vector struct {
x, y int
}
func main() {
scanner := bufio.NewScanner(os.Stdin)
scanner.Scan()
line := scanner.Text()
elts := strings.Split(line, "..")
eltsx1 := strings.Split(elts[0], "=")
x1, _ := strconv.Atoi(eltsx1[1])
eltsx2 := strings.Split(elts[1], ",")
x2, _ := strconv.Atoi(eltsx2[0])
eltsy1 := strings.Split(elts[1], "=")
y1, _ := strconv.Atoi(eltsy1[1])
y2, _ := strconv.Atoi(elts[2])
possible := 0
for nextVx := 0; nextVx <= x2; nextVx++ {
out:
for nextVy := y1; nextVy < 1000; nextVy++ {
vx := nextVx
vy := nextVy
x := 0
y := 0
for {
if x >= x1 && x <= x2 && y >= y1 && y <= y2 {
possible++
continue out
}
if x > x2 || y < y1 {
break
}
if vx >= 0 {
x += vx
vx--
}
y += vy
vy--
}
}
}
fmt.Println(possible)
}