For problem statement at 1000-1999/1100-1199/1170-1179/1172/problemA.txt this is a correct solution, but verifier at 1000-1999/1100-1199/1170-1179/1172/verifierA.go ends with All tests passed can you fix the verifier? package main

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

func main() {
	reader := bufio.NewReader(os.Stdin)
	var n int
	fmt.Fscan(reader, &n)

	a := make([]int, n)
	for i := 0; i < n; i++ {
		fmt.Fscan(reader, &a[i])
	}

	b := make([]int, n)
	pos1 := -1
	for i := 0; i < n; i++ {
		fmt.Fscan(reader, &b[i])
		if b[i] == 1 {
			pos1 = i
		}
	}

	if pos1 != -1 {
		isSuffix := true
		for i := pos1; i < n; i++ {
			if b[i] != i-pos1+1 {
				isSuffix = false
				break
			}
		}
		if isSuffix {
			k := n - pos1
			possible := true
			for i := 0; i < pos1; i++ {
				if b[i] != 0 && b[i]-(i+1) <= k {
					possible = false
					break
				}
			}
			if possible {
				fmt.Println(n - k)
				return
			}
		}
	}

	T := 1
	for i := 0; i < n; i++ {
		if b[i] != 0 {
			if (i+1)-b[i]+2 > T {
				T = (i + 1) - b[i] + 2
			}
		}
	}
	fmt.Println(T + n - 1)
}