aoc2024/02/code.go

package main

import (
	"bufio"
	"fmt"
	"log"
	"os"
	"strconv"
	"strings"
)

func readInput(file *os.File) [][]int {
	scanner := bufio.NewScanner(file)
	var reports [][]int

	for scanner.Scan() {
		line := scanner.Text()
		if line == "" {
			break
		}

		var report []int
		numbers := strings.Split(line, " ")
		for _, number := range numbers {
			level, err := strconv.Atoi(number)
			if err != nil {
				log.Fatalf("Problem parsing input: %s", err)
			}

			report = append(report, level)
		}

		reports = append(reports, report)
	}

	return reports
}

func main() {
	if len(os.Args) < 2 {
		log.Fatal("You need to specify a file!")
	}

	filePath := os.Args[1]
	file, err := os.Open(filePath)
	if err != nil {
		log.Fatalf("Failed to open %s!\n", filePath)
	}

	reports := readInput(file)
	fmt.Println(reports)
}