Initial commit, day 1 in go.

Author: cjavad

01/README.md

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+# --- Day 1: Calorie Counting ---

01/day1.go

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+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+)
+
+func main() {
+	fmt.Println("Part 1: ", part1())
+	fmt.Println("Part 2: ", part2(3))
+}
+
+func part1() int64 {
+	highestTotal := int64(0)
+	inventories := parseElvesInventory(readInput("input.txt"))
+	sumOfInventories := getSumArray(inventories)
+
+	for _, total := range sumOfInventories {
+		if total > highestTotal {
+			highestTotal = int64(total)
+		}
+	}
+
+	return highestTotal
+}
+
+func part2(n int) int64 {
+	// Finds n highest numbers in the input
+	inventories := parseElvesInventory(readInput("input.txt"))
+	sumOfInventories := getSumArray(inventories)
+	// Sort sumOfInventories
+	// Return the first n numbers
+
+	for i := 0; i < len(sumOfInventories); i++ {
+		for j := 0; j < len(sumOfInventories); j++ {
+			if sumOfInventories[i] > sumOfInventories[j] {
+				sumOfInventories[i], sumOfInventories[j] = sumOfInventories[j], sumOfInventories[i]
+			}
+		}
+	}
+
+	return sum(sumOfInventories[:n])
+}
+
+func readInput(inputfile string) []string {
+	// Read the input file
+	input, err := os.Open(inputfile)
+	if err != nil {
+		panic(err)
+	}
+	defer input.Close()
+	var lines []string
+	scanner := bufio.NewScanner(input)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	return lines
+}
+
+func parseElvesInventory(input []string) map[int][]int64 {
+	elvesInventory := make(map[int][]int64)
+	inventoryIndex := 0
+	for _, line := range input {
+		if elvesInventory[inventoryIndex] == nil {
+			elvesInventory[inventoryIndex] = make([]int64, 0)
+		}
+
+		if line == "" {
+			inventoryIndex++
+			continue
+		}
+
+		// Add the new item to the inventory
+		item, err := strconv.ParseInt(line, 10, 64)
+
+		if err != nil {
+			continue
+		}
+
+		elvesInventory[inventoryIndex] = append(elvesInventory[inventoryIndex], item)
+
+	}
+	return elvesInventory
+}
+
+func getSumArray(input map[int][]int64) []int64 {
+	sumArray := make([]int64, len(input))
+	for i := 0; i < len(input); i++ {
+		sumArray[i] = sum(input[i])
+	}
+	return sumArray
+}
+
+func sum(input []int64) int64 {
+	sum := int64(0)
+	for _, item := range input {
+		sum += item
+	}
+	return sum
+}

01/input.test.txt

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+1000
+2000
+3000
+
+4000
+
+5000
+6000
+
+7000
+8000
+9000
+
+10000