For problem statement at 1000-1999/1900-1999/1950-1959/1958/problemI.txt this is a correct solution, but verifier at 1000-1999/1900-1999/1950-1959/1958/verifierI.go ends with all tests passed can you fix the verifier? ```go
package main

import (
	"bufio"
	"fmt"
	"math/bits"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	var n int
	if _, err := fmt.Fscan(reader, &n); err != nil {
		return
	}

	a := make([]int, n+1)
	b := make([]int, n+1)
	for i := 2; i <= n; i++ {
		fmt.Fscan(reader, &a[i])
	}
	for i := 2; i <= n; i++ {
		fmt.Fscan(reader, &b[i])
	}

	anc1 := make([][]bool, n+1)
	for i := 1; i <= n; i++ {
		anc1[i] = make([]bool, n+1)
		curr := i
		for curr != 1 {
			curr = a[curr]
			anc1[i][curr] = true
		}
	}

	anc2 := make([][]bool, n+1)
	for i := 1; i <= n; i++ {
		anc2[i] = make([]bool, n+1)
		curr := i
		for curr != 1 {
			curr = b[curr]
			anc2[i][curr] = true
		}
	}

	V := n - 1
	if V == 0 {
		fmt.Println(0)
		return
	}

	adj := make([]int, V)
	for i := 0; i < V; i++ {
		u := i + 2
		for j := i + 1; j < V; j++ {
			v := j + 2
			if anc1[u][v] != anc2[u][v] || anc1[v][u] != anc2[v][u] {
				adj[i] |= (1 << j)
				adj[j] |= (1 << i)
			}
		}
	}

	L := V / 2
	R := V - L

	adj_L := make([]int, L)
	adj_R_from_L := make([]int, L)
	for i := 0; i < L; i++ {
		adj_L[i] = adj[i] & ((1 << L) - 1)
		adj_R_from_L[i] = adj[i] >> L
	}

	adj_R_only := make([]int, R)
	for i := 0; i < R; i++ {
		adj_R_only[i] = adj[L+i] >> L
	}

	dp_R := make([]int, 1<<R)
	dp_R[0] = 0
	for mask := 1; mask < (1 << R); mask++ {
		v := bits.TrailingZeros(uint(mask))
		prevMask := mask & (mask - 1)
		opt1 := dp_R[prevMask]
		opt2 := 1 + dp_R[prevMask&^adj_R_only[v]]
		if opt1 > opt2 {
			dp_R[mask] = opt1
		} else {
			dp_R[mask] = opt2
		}
	}

	max_indep := 0
	var solve_left func(allowed_L int, current_size int, valid_R int)
	solve_left = func(allowed_L int, current_size int, valid_R int) {
		if allowed_L == 0 {
			cand := current_size + dp_R[valid_R]
			if cand > max_indep {
				max_indep = cand
			}
			return
		}

		idx := bits.TrailingZeros(uint(allowed_L))
		prevAllowed := allowed_L & (allowed_L - 1)

		solve_left(prevAllowed, current_size, valid_R)

		new_allowed_L := prevAllowed &^ adj_L[idx]
		new_valid_R := valid_R &^ adj_R_from_L[idx]
		solve_left(new_allowed_L, current_size+1, new_valid_R)
	}

	solve_left((1<<L)-1, 0, (1<<R)-1)

	ans := 2*n - 2*(max_indep+1)
	fmt.Println(ans)
}
```