For problem statement at 1000-1999/1200-1299/1260-1269/1265/problemB.txt this is a correct solution, but verifier at 1000-1999/1200-1299/1260-1269/1265/verifierB.go ends with All tests passed can you fix the verifier? package main

import (
	"bufio"
	"fmt"
	"io"
	"os"
)

func main() {
	data, _ := io.ReadAll(os.Stdin)
	idx := 0
	nextInt := func() int {
		for idx < len(data) && (data[idx] < '0' || data[idx] > '9') {
			idx++
		}
		val := 0
		for idx < len(data) && data[idx] >= '0' && data[idx] <= '9' {
			val = val*10 + int(data[idx]-'0')
			idx++
		}
		return val
	}

	t := nextInt()
	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	defer out.Flush()

	for ; t > 0; t-- {
		n := nextInt()
		pos := make([]int, n+1)
		for i := 1; i <= n; i++ {
			x := nextInt()
			pos[x] = i
		}

		ans := make([]byte, n)
		mn, mx := n+1, 0
		for m := 1; m <= n; m++ {
			if pos[m] < mn {
				mn = pos[m]
			}
			if pos[m] > mx {
				mx = pos[m]
			}
			if mx-mn+1 == m {
				ans[m-1] = '1'
			} else {
				ans[m-1] = '0'
			}
		}

		fmt.Fprintln(out, string(ans))
	}
}