Add day6 solution

Author: Ale Paredes

2023/day6/inp.txt

@@ -0,0 +1,2 @@
+Time:        53     89     76     98
+Distance:   313   1090   1214   1201

2023/day6/main.go

@@ -0,0 +1,84 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+type Record struct {
+	lowHold  int
+	highHold int
+}
+
+func parseLine(line string) []int {
+	var result []int
+
+	re := regexp.MustCompile(`\d+`)
+	for _, e := range re.FindAllString(line, -1) {
+		i, err := strconv.Atoi(e)
+		if err != nil {
+			fmt.Println(err)
+		}
+
+		result = append(result, i)
+	}
+
+	return result
+}
+
+func beatRecord(time int, distance int) Record {
+	var record Record
+
+	for hold := 1; hold <= time; hold++ {
+		travelDistance := hold * (time - hold)
+
+		if record.highHold != 0 && record.lowHold != 0 {
+			break
+		}
+
+		if travelDistance > distance {
+			record.lowHold = hold
+			record.highHold = time - hold
+		}
+
+	}
+
+	return record
+}
+
+func main() {
+
+	input, err := os.ReadFile("inp.txt")
+	if err != nil {
+		fmt.Println(err)
+	}
+	lines := strings.Split(string(input), "\n")
+
+	times := parseLine(string(lines[0]))
+	distances := parseLine(string(lines[1]))
+
+	ways := 1
+
+	for i, time := range times {
+		record := beatRecord(time, distances[i])
+		ways *= record.highHold - record.lowHold + 1
+	}
+
+	fmt.Println("Part 1", ways)
+
+	correctTime, err := strconv.Atoi(strings.Replace(strings.TrimPrefix(string(lines[0]), "Time:"), " ", "", -1))
+	if err != nil {
+		fmt.Println(err)
+	}
+	correctDistance, err := strconv.Atoi(strings.Replace(strings.TrimPrefix(string(lines[1]), "Distance:"), " ", "", -1))
+	if err != nil {
+		fmt.Println(err)
+	}
+
+	record := beatRecord(correctTime, correctDistance)
+
+	fmt.Println("Part 2", record.highHold-record.lowHold+1)
+}