aoc2023/day-6/util.go

package main

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

// readlines reads lines from stdin.
// Then it returns them as an array of strings
func readlines() []string {
	lines := []string{}

	scanner := bufio.NewScanner(os.Stdin)
	for scanner.Scan() {
		lines = append(lines, scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		log.Fatal(err)
	}

	return lines
}

func parseLines(lines []string) {
	f := func(c rune) bool {
		return !unicode.IsDigit(c)
	}

	times := []int{}
	distances := []int{}
	for _, line := range lines {
		if strings.HasPrefix(line, "Time") {
			times = convertToInts(strings.FieldsFunc(line, f))
		} else {
			distances = convertToInts(strings.FieldsFunc(line, f))
		}
	}

	for i := range times {
		datas = append(datas, data{time: times[i], distance: distances[i]})
	}
}

// convertToInts converts a string representing ints to an array of ints
func convertToInts(data []string) []int {
	nums := []int{}
	for _, elem := range data {
		n, _ := strconv.Atoi(elem)
		nums = append(nums, n)
	}
	return nums
}