aoc2023/day-4/util.go

package main

import (
	"bufio"
	"log"
	"math"
	"os"
	"strconv"
)

// 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 parseAllCards(line string) {
	groups := M{}
	res := _regex_winning_numbers.FindStringSubmatch(line)
	names := _regex_winning_numbers.SubexpNames()
	for i := range res {
		groups[names[i]] = res[i]
	}
	allCards = append(allCards, groups)
}

// numStrToArr converts a string of numbers or an array of numbers
func numStrToArr(nums string, arr []int) ([]int, error) {
	for _, num := range _regex_nums.FindAllString(nums, -1) {
		n, err := strconv.Atoi(num)
		if err != nil {
			return []int{}, err
		}
		arr = append(arr, n)
	}
	return arr, nil
}

// contains returns true if an slice of elements contains a given element
func contains[T comparable](elems []T, v T) bool {
	for _, s := range elems {
		if v == s {
			return true
		}
	}
	return false
}

// pow returns the value of x to the n
func pow(x, n int) int {
	return int(math.Pow(float64(x), float64(n)))
}