aoc2024/day-02/internal/one/solve.go

package one

import (
	"bufio"
	"bytes"
	"io"

	"github.com/onyx-and-iris/aoc2024/day-02/internal/util"
)

type comparator func([]int, int) bool

func Solve(buf []byte) (int, error) {
	r := bytes.NewReader(buf)
	sum, err := parseLines(r)
	if err != nil {
		return 0, err
	}

	return sum, nil
}

func parseLines(r io.Reader) (int, error) {
	var sum int

	scanner := bufio.NewScanner(r)
	for scanner.Scan() {
		nums := util.IntsFromString(scanner.Text())

		if check(nums, util.CmpIncrease) || check(nums, util.CmpDecrease) {
			sum++
		}
	}

	if err := scanner.Err(); err != nil {
		return 0, err
	}

	return sum, nil
}