Added solutions for 17th day: target practice

2021/17/second.go

@@ -0,0 +1,54 @@
+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)
+}