For problem statement at 0-999/0-99/40-49/44/problemI.txt this is a correct solution, but verifier at 0-999/0-99/40-49/44/verifierI.go ends with case 1 failed: expected "1\n{1}" got "1\n1"
input:1
exit status 1 can you fix the verifier? ```go
package main

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

var (
	n      int
	pos    []int
	dirs   []int
	total  int
	output [][]int
)

func solve(idx, k int) {
	if idx == n+1 {
		part := make([]int, n+1)
		copy(part, pos)
		output = append(output, part)
		total++
		return
	}

	if dirs[idx] == 1 {
		for b := 1; b <= k; b++ {
			pos[idx] = b
			solve(idx+1, k)
			if idx+1 <= n {
				dirs[idx+1] *= -1
			}
		}
		pos[idx] = k + 1
		solve(idx+1, k+1)
		if idx+1 <= n {
			dirs[idx+1] *= -1
		}
	} else {
		pos[idx] = k + 1
		solve(idx+1, k+1)
		if idx+1 <= n {
			dirs[idx+1] *= -1
		}
		for b := k; b >= 1; b-- {
			pos[idx] = b
			solve(idx+1, k)
			if idx+1 <= n {
				dirs[idx+1] *= -1
			}
		}
	}
}

func main() {
	if _, err := fmt.Scan(&n); err != nil {
		return
	}
	
	pos = make([]int, n+1)
	dirs = make([]int, n+1)
	for i := 1; i <= n; i++ {
		dirs[i] = 1
	}

	solve(1, 0)

	out := bufio.NewWriter(os.Stdout)
	defer out.Flush()

	fmt.Fprintln(out, total)
	for _, p := range output {
		maxB := 0
		for i := 1; i <= n; i++ {
			if p[i] > maxB {
				maxB = p[i]
			}
		}

		var piles []string
		for b := 1; b <= maxB; b++ {
			var elements []string
			for i := 1; i <= n; i++ {
				if p[i] == b {
					elements = append(elements, strconv.Itoa(i))
				}
			}
			piles = append(piles, strings.Join(elements, ","))
		}
		
		fmt.Fprintln(out, strings.Join(piles, "-"))
	}
}
```