package cses

import "fmt"

func WeirdAlgo(n int) string {
	seq := []int{}

	for n != 1 {
		seq = append(seq, n)

		if n%2 == 0 {
			n /= 2
		} else {
			n = n*3 + 1
		}
	}

	seq = append(seq, 1)

	return fmt.Sprint(seq)
}

func MissingNumber(n int, numbers []int) int {

	if n != len(numbers)+1 {
		return -1
	}

	present := make([]bool, n)

	for _, i := range numbers {

		if i > n {
			return -2
		}

		present[i-1] = true
	}

	for i, b := range present {
		if !b {
			return i + 1
		}
	}

	return -3
}