Day11

day11/day11.go

@@ -0,0 +1,118 @@
+package main
+
+import (
+	"AOC2022/helper"
+	"fmt"
+	"os"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+type Monkey struct {
+	items        []int
+	newOperation func(item int) int
+	test         func(item int) int
+	inspections  int
+}
+
+func main() {
+	args := os.Args[1:]
+	lines := helper.ReadTextFile(args[0])
+	runSimulation(lines, 20, true)
+	runSimulation(lines, 10000, false)
+
+}
+
+func runSimulation(lines []string, turns int, part1 bool) {
+	monkeys, worryLimiter := getMonkeys(lines, part1)
+	for i := 0; i < turns; i++ {
+		for i := 0; i < len(monkeys); i++ {
+			monkey := &monkeys[i]
+			for _, item := range monkey.items {
+				monkey.inspections++
+				item = monkey.newOperation(item) % worryLimiter
+				throwTo := monkey.test(item)
+				monkeys[throwTo].items = append(monkeys[throwTo].items, item)
+			}
+			monkey.items = []int{}
+		}
+	}
+	sort.Slice(monkeys, func(i, j int) bool {
+		return monkeys[i].inspections > monkeys[j].inspections
+	})
+	fmt.Println(monkeys[0].inspections * monkeys[1].inspections)
+}
+
+func getMonkeys(lines []string, part1 bool) ([]Monkey, int) {
+	var monkeys []Monkey
+	worryLimiter := 1
+	for i := 0; i < len(lines); i += 7 {
+		monkey := Monkey{}
+		startingItemsString := lines[i+1][18:]
+		for _, item := range strings.Split(startingItemsString, ", ") {
+			monkey.items = append(monkey.items, helper.RemoveError(strconv.Atoi(item)))
+		}
+		worryLimiter *= getTest(lines, i, &monkey)
+		getOperation(lines, i, &monkey, part1)
+		monkeys = append(monkeys, monkey)
+	}
+	return monkeys, worryLimiter
+}
+
+func getTest(lines []string, i int, monkey *Monkey) int {
+	divisbleby := helper.RemoveError(strconv.Atoi(lines[i+3][21:]))
+	returnTrue := helper.RemoveError(strconv.Atoi(lines[i+4][29:]))
+	returnFalse := helper.RemoveError(strconv.Atoi(lines[i+5][30:]))
+	monkey.test = func(item int) int {
+		if item%divisbleby == 0 {
+			return returnTrue
+		}
+		return returnFalse
+	}
+	return divisbleby
+}
+
+func getOperation(lines []string, i int, monkey *Monkey, part1 bool) {
+	opertionString := lines[i+2][23:]
+	value, err := strconv.Atoi(opertionString[2:])
+	if err == nil {
+		if opertionString[0] == '+' {
+			monkey.newOperation = func(item int) (returnVal int) {
+				returnVal = (item + value)
+				if part1 {
+					returnVal /= 3
+				}
+				return
+			}
+		}
+		if opertionString[0] == '*' {
+			monkey.newOperation = func(item int) (returnVal int) {
+				returnVal = (item * value)
+				if part1 {
+					returnVal /= 3
+				}
+				return
+			}
+		}
+	} else {
+		if opertionString[0] == '+' {
+			monkey.newOperation = func(item int) (returnVal int) {
+				returnVal = item + item
+				if part1 {
+					returnVal /= 3
+				}
+				return
+			}
+		}
+		if opertionString[0] == '*' {
+			monkey.newOperation = func(item int) (returnVal int) {
+				returnVal = item * item
+				if part1 {
+					returnVal /= 3
+				}
+				return
+			}
+		}
+	}
+}

day11/input

@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 54, 61, 97, 63, 74
+  Operation: new = old * 7
+  Test: divisible by 17
+    If true: throw to monkey 5
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 61, 70, 97, 64, 99, 83, 52, 87
+  Operation: new = old + 8
+  Test: divisible by 2
+    If true: throw to monkey 7
+    If false: throw to monkey 6
+
+Monkey 2:
+  Starting items: 60, 67, 80, 65
+  Operation: new = old * 13
+  Test: divisible by 5
+    If true: throw to monkey 1
+    If false: throw to monkey 6
+
+Monkey 3:
+  Starting items: 61, 70, 76, 69, 82, 56
+  Operation: new = old + 7
+  Test: divisible by 3
+    If true: throw to monkey 5
+    If false: throw to monkey 2
+
+Monkey 4:
+  Starting items: 79, 98
+  Operation: new = old + 2
+  Test: divisible by 7
+    If true: throw to monkey 0
+    If false: throw to monkey 3
+
+Monkey 5:
+  Starting items: 72, 79, 55
+  Operation: new = old + 1
+  Test: divisible by 13
+    If true: throw to monkey 2
+    If false: throw to monkey 1
+
+Monkey 6:
+  Starting items: 63
+  Operation: new = old + 4
+  Test: divisible by 19
+    If true: throw to monkey 7
+    If false: throw to monkey 4
+
+Monkey 7:
+  Starting items: 72, 51, 93, 63, 80, 86, 81
+  Operation: new = old * old
+  Test: divisible by 11
+    If true: throw to monkey 0
+    If false: throw to monkey 4

day11/testinput

@@ -0,0 +1,27 @@
+Monkey 0:
+  Starting items: 79, 98
+  Operation: new = old * 19
+  Test: divisible by 23
+    If true: throw to monkey 2
+    If false: throw to monkey 3
+
+Monkey 1:
+  Starting items: 54, 65, 75, 74
+  Operation: new = old + 6
+  Test: divisible by 19
+    If true: throw to monkey 2
+    If false: throw to monkey 0
+
+Monkey 2:
+  Starting items: 79, 60, 97
+  Operation: new = old * old
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 74
+  Operation: new = old + 3
+  Test: divisible by 17
+    If true: throw to monkey 0
+    If false: throw to monkey 1