For problem statement at 1000-1999/1200-1299/1280-1289/1286/problemB.txt this is a correct solution, but verifier at 1000-1999/1200-1299/1280-1289/1286/verifierB.go ends with All tests passed can you fix the verifier? ```go
package main

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

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var n int
	fmt.Fscan(reader, &n)

	parent := make([]int, n+1)
	c := make([]int, n+1)
	children := make([][]int, n+1)
	root := -1

	for i := 1; i <= n; i++ {
		fmt.Fscan(reader, &parent[i], &c[i])
		if parent[i] == 0 {
			root = i
		} else {
			children[parent[i]] = append(children[parent[i]], i)
		}
	}

	// Compute subtree sizes
	subtreeSize := make([]int, n+1)
	// Topological order via BFS
	order := make([]int, 0, n)
	queue := []int{root}
	for len(queue) > 0 {
		v := queue[0]
		queue = queue[1:]
		order = append(order, v)
		for _, ch := range children[v] {
			queue = append(queue, ch)
		}
	}
	// Process in reverse order to compute subtree sizes
	for i := len(order) - 1; i >= 0; i-- {
		v := order[i]
		subtreeSize[v] = 1
		for _, ch := range children[v] {
			subtreeSize[v] += subtreeSize[ch]
		}
	}

	// For each vertex, we need to assign a rank within its subtree.
	// c[i] = number of vertices j in subtree of i with a[j] < a[i]
	// This means a[i] should be the (c[i]+1)-th smallest in its subtree.

	// We process from the root down. For each vertex, we have a list of
	// available "slots" (sorted positions). The vertex picks slot c[i] (0-indexed),
	// then the remaining slots are distributed to children's subtrees.

	// Each vertex gets a list of available values. We process DFS.
	// The root gets values [1..n].

	ans := make([]int, n+1)
	valid := true

	// We'll use a slice-based approach. Each vertex receives a sorted slice of available values.
	// It picks the c[i]-th one, removes it, then distributes the rest to children subtrees
	// in order of how we split them.

	type frame struct {
		v      int
		values []int
	}

	stack := []frame{{root, nil}}
	// Initialize root values
	rootVals := make([]int, n)
	for i := 0; i < n; i++ {
		rootVals[i] = i + 1
	}
	stack[0].values = rootVals

	for len(stack) > 0 && valid {
		top := stack[len(stack)-1]
		stack = stack[:len(stack)-1]
		v := top.v
		vals := top.values

		if len(vals) != subtreeSize[v] {
			valid = false
			break
		}

		if c[v] >= len(vals) {
			valid = false
			break
		}

		// Pick the c[v]-th value (0-indexed)
		ans[v] = vals[c[v]]

		// Remove that element
		remaining := make([]int, 0, len(vals)-1)
		remaining = append(remaining, vals[:c[v]]...)
		remaining = append(remaining, vals[c[v]+1:]...)

		// Distribute remaining to children subtrees
		// The remaining is still sorted. We assign first subtreeSize[ch1] to child1, etc.
		idx := 0
		for _, ch := range children[v] {
			sz := subtreeSize[ch]
			if idx+sz > len(remaining) {
				valid = false
				break
			}
			childVals := remaining[idx : idx+sz]
			idx += sz
			stack = append(stack, frame{ch, childVals})
		}
		if idx != len(remaining) {
			valid = false
		}
	}

	if !valid {
		fmt.Fprintln(writer, "NO")
		return
	}

	fmt.Fprintln(writer, "YES")
	for i := 1; i <= n; i++ {
		if i > 1 {
			fmt.Fprint(writer, " ")
		}
		fmt.Fprint(writer, ans[i])
	}
	fmt.Fprintln(writer)
}
```