aoc2023/day-9/util.go

package main

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

// readlines reads lines from stdin.
// returns input 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
}

// convertToInts converts a string representing ints to an array of ints
func convertToInts(line string) []int {
	numStr := strings.Split(line, " ")
	nums := make([]int, 0)
	for _, elem := range numStr {
		n, _ := strconv.Atoi(elem)
		nums = append(nums, n)
	}
	return nums
}

// allEqual returns true if all values in array are equal
func allEqual(a []int) bool {
	for i := 1; i < len(a); i++ {
		if a[i] != a[0] {
			return false
		}
	}
	return true
}