From d582965b1c3dacd6a63965a757ec4920a078883b Mon Sep 17 00:00:00 2001
From: Karl Spickermann <karliosos65@googlemail.com>
Date: Mon, 6 Dec 2021 13:43:37 +0100
Subject: [PATCH] Day6

---
 src/day6/day6.go       | 61 ++++++++++++++++++++++++++++++++++++++++++
 src/day6/day6Input.txt |  1 +
 src/day6/day6Test.txt  |  1 +
 3 files changed, 63 insertions(+)
 create mode 100644 src/day6/day6.go
 create mode 100644 src/day6/day6Input.txt
 create mode 100644 src/day6/day6Test.txt

diff --git a/src/day6/day6.go b/src/day6/day6.go
new file mode 100644
index 0000000..c989186
--- /dev/null
+++ b/src/day6/day6.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"AOC2021/src/helper"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	args := os.Args[1:]
+	input, err := helper.GetInput(args[0])
+	if err != nil {
+		fmt.Println(err)
+	}
+	inputNumbers, _ := helper.MapToNumber(strings.Split(input[0], ","))
+	fishArray := [9]int{0, 0, 0, 0, 0, 0, 0, 0, 0}
+	for _, inputNumber := range inputNumbers {
+		fishArray[inputNumber] += 1
+	}
+	fmt.Println(fishArray)
+	simulateNDays(fishArray, 80)
+	simulateNDays(fishArray, 256)
+}
+
+func simulateNDays(fishArray [9]int, n int) {
+	i := 0
+	for i < n {
+		daysPassed := 0
+		fishArray, daysPassed = step(fishArray)
+		i += daysPassed
+	}
+	fmt.Println(getSum(fishArray))
+}
+
+func step(input [9]int) ([9]int, int) {
+	newArray := [9]int{0, 0, 0, 0, 0, 0, 0, 0, 0}
+	lowestTimerIndex := findIndexOfFirstNonzero(input)
+	amountCreatingFishes ,a1 := input[lowestTimerIndex] , input[lowestTimerIndex+1:]
+	copy(newArray[:], a1[:8-lowestTimerIndex])
+	newArray[8] += amountCreatingFishes
+	newArray[6] += amountCreatingFishes
+	return newArray, lowestTimerIndex + 1
+}
+
+func getSum(input [9]int)  int{
+	sum := 0
+	for _,number := range input {
+		sum += number
+	}
+	return sum
+}
+
+func findIndexOfFirstNonzero(input [9]int) int {
+	for i, number := range input {
+		if number != 0 {
+			return i
+		}
+	}
+	return -1
+}
\ No newline at end of file
diff --git a/src/day6/day6Input.txt b/src/day6/day6Input.txt
new file mode 100644
index 0000000..b30a9d2
--- /dev/null
+++ b/src/day6/day6Input.txt
@@ -0,0 +1 @@
+1,3,1,5,5,1,1,1,5,1,1,1,3,1,1,4,3,1,1,2,2,4,2,1,3,3,2,4,4,4,1,3,1,1,4,3,1,5,5,1,1,3,4,2,1,5,3,4,5,5,2,5,5,1,5,5,2,1,5,1,1,2,1,1,1,4,4,1,3,3,1,5,4,4,3,4,3,3,1,1,3,4,1,5,5,2,5,2,2,4,1,2,5,2,1,2,5,4,1,1,1,1,1,4,1,1,3,1,5,2,5,1,3,1,5,3,3,2,2,1,5,1,1,1,2,1,1,2,1,1,2,1,5,3,5,2,5,2,2,2,1,1,1,5,5,2,2,1,1,3,4,1,1,3,1,3,5,1,4,1,4,1,3,1,4,1,1,1,1,2,1,4,5,4,5,5,2,1,3,1,4,2,5,1,1,3,5,2,1,2,2,5,1,2,2,4,5,2,1,1,1,1,2,2,3,1,5,5,5,3,2,4,2,4,1,5,3,1,4,4,2,4,2,2,4,4,4,4,1,3,4,3,2,1,3,5,3,1,5,5,4,1,5,1,2,4,2,5,4,1,3,3,1,4,1,3,3,3,1,3,1,1,1,1,4,1,2,3,1,3,3,5,2,3,1,1,1,5,5,4,1,2,3,1,3,1,1,4,1,3,2,2,1,1,1,3,4,3,1,3
\ No newline at end of file
diff --git a/src/day6/day6Test.txt b/src/day6/day6Test.txt
new file mode 100644
index 0000000..a7af2b1
--- /dev/null
+++ b/src/day6/day6Test.txt
@@ -0,0 +1 @@
+3,4,3,1,2
\ No newline at end of file