day 17b complete

took a little longer than expected because the regex was picking the '.' up before the numbers and causing it to become a truncated float... this made it 0 and thus the incorrect coordinate value.

day17/17a/main.go

@@ -94,7 +94,7 @@ func returnContent(path string) *[]int {
 	defer file.Close()
 
 	scanner := bufio.NewScanner(file)
-	regex, _ := regexp.Compile(`[-+]?[.]?[\d]+`)
+	regex, _ := regexp.Compile(`[-+]?[\d]+`)
 
 	strings := []string{}
 

day17/17b/main.go

@@ -0,0 +1,125 @@
+package main
+
+import (
+	"AdventOfCode2021/shared"
+	"bufio"
+	"fmt"
+	"os"
+	"regexp"
+	"strconv"
+)
+
+func main() {
+	content := returnContent("../input")
+	//content := returnContent("../testInput")
+
+	coordLeft := shared.Coordinate{
+		X: shared.Min((*content)[0], (*content)[1]),
+		Y: shared.Max((*content)[2], (*content)[3]),
+	}
+	coordRight := shared.Coordinate{
+		X: shared.Max((*content)[0], (*content)[1]),
+		Y: shared.Min((*content)[2], (*content)[3]),
+	}
+
+	answer := make(map[shared.Coordinate]bool)
+
+	y := 0
+
+	for {
+		for x := 1; x <= coordRight.X; x++ {
+			//Test with positive Y velocity
+			probe := Probe{
+				Position: &shared.Coordinate{X: 0, Y: 0},
+				Velocity: &shared.Coordinate{X: x, Y: y},
+			}
+			success, _ := probe.Model(&coordLeft, &coordRight)
+			if success {
+				answer[shared.Coordinate{X: x, Y: y}] = true
+			}
+
+			//Test with negative Y velocity
+			probe = Probe{
+				Position: &shared.Coordinate{X: 0, Y: 0},
+				Velocity: &shared.Coordinate{X: x, Y: -y},
+			}
+			success, _ = probe.Model(&coordLeft, &coordRight)
+			if success {
+				answer[shared.Coordinate{X: x, Y: -y}] = true
+			}
+		}
+		fmt.Println(len(answer))
+		y++
+	}
+
+}
+
+type Probe struct {
+	Position *shared.Coordinate
+	Velocity *shared.Coordinate
+}
+
+func (p *Probe) Step() {
+	p.Position.X += p.Velocity.X
+	p.Position.Y += p.Velocity.Y
+
+	if p.Velocity.X > 0 {
+		p.Velocity.X--
+	} else if p.Velocity.X < 0 {
+		p.Velocity.X++
+	}
+
+	p.Velocity.Y--
+}
+
+func (p *Probe) Model(left *shared.Coordinate, right *shared.Coordinate) (success bool, maxY int) {
+	maxY = 0
+	for p.Position.X <= right.X && p.Position.Y >= right.Y {
+		p.Step()
+		if p.Position.Y > maxY {
+			maxY = p.Position.Y
+		}
+		if CheckLocation(p, left, right) {
+			return true, maxY
+		}
+	}
+	return false, maxY
+}
+
+func CheckLocation(probe *Probe, left *shared.Coordinate, right *shared.Coordinate) bool {
+	if probe.Position.X >= left.X && probe.Position.X <= right.X {
+		if probe.Position.Y <= left.Y && probe.Position.Y >= right.Y {
+			return true
+		}
+	}
+	return false
+}
+
+func returnContent(path string) *[]int {
+	//read file and return it as an array of integers
+
+	file, err := os.Open(path)
+	var content []int
+
+	if err != nil {
+		fmt.Println("Unlucky, the file didn't open")
+		return &content
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	regex, _ := regexp.Compile(`[-+]?[\d]+`)
+
+	strings := []string{}
+
+	for scanner.Scan() {
+		strings = regex.FindAllString(scanner.Text(), 4)
+	}
+
+	for _, val := range strings {
+		num, _ := strconv.Atoi(val)
+		content = append(content, num)
+	}
+
+	return &content
+}