day 6b complete

day6/day 6b/go.mod

@@ -0,0 +1,3 @@
+module PWD
+
+go 1.17

day6/day 6b/main.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func main() {
+
+	content := returnContent("../input")
+	//content := returnContent("testInput")
+	fmt.Println(content)
+
+	days := 256
+
+	var waitTime [9]int
+
+	for _, v := range *content {
+		waitTime[v]++
+	}
+
+	fmt.Println(waitTime)
+
+	for gen := 0; gen < days; gen++ {
+		justBred := waitTime[0]
+
+		for daysToWait := range waitTime[:len(waitTime)-1] {
+			//Move array down a position
+			waitTime[daysToWait] = waitTime[daysToWait+1]
+		}
+
+		//Add new fish and fish that have just bred (fallen off end of array)
+		waitTime[6] += justBred //start waiting other 6 days
+		waitTime[8] = justBred  //new fishes
+	}
+
+	var numFishes int
+
+	for _, fishes := range waitTime {
+		numFishes += fishes
+	}
+
+	fmt.Println(numFishes)
+}
+
+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)
+	for scanner.Scan() {
+		text := strings.Split(scanner.Text(), ",")
+		for _, v := range text {
+			num, _ := strconv.Atoi(v)
+			content = append(content, num)
+		}
+	}
+
+	return &content
+}

day6/day 6b/testInput

@@ -0,0 +1 @@
+3,4,3,1,2