For problem statement at 0-999/600-699/630-639/639/problemA.txt this is a correct solution, but verifier at 0-999/600-699/630-639/639/verifierA.go ends with  can you fix the verifier? ```go
package main

import (
	"bufio"
	"os"
	"sort"
	"strconv"
)

type friend struct {
	id    int
	score int
}

type bit struct {
	tree []int
	size int
}

func newBit(size int) *bit {
	return &bit{
		tree: make([]int, size+1),
		size: size,
	}
}

func (b *bit) update(idx, val int) {
	for idx <= b.size {
		b.tree[idx] += val
		idx += idx & -idx
	}
}

func (b *bit) query(idx int) int {
	sum := 0
	for idx > 0 {
		sum += b.tree[idx]
		idx -= idx & -idx
	}
	return sum
}

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Split(bufio.ScanWords)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	readInt := func() int {
		scanner.Scan()
		val, _ := strconv.Atoi(scanner.Text())
		return val
	}

	n := readInt()
	k := readInt()
	q := readInt()

	friends := make([]friend, n)
	for i := 0; i < n; i++ {
		friends[i] = friend{id: i + 1, score: readInt()}
	}

	// Create a copy to sort and determine ranks based on score
	sorted := make([]friend, n)
	copy(sorted, friends)
	
	// Sort descending by score
	sort.Slice(sorted, func(i, j int) bool {
		return sorted[i].score > sorted[j].score
	})

	// Map friend ID to rank (1-based, 1 is best score)
	rank := make([]int, n+1)
	for i, f := range sorted {
		rank[f.id] = i + 1
	}

	tree := newBit(n)
	online := make([]bool, n+1)

	for i := 0; i < q; i++ {
		kind := readInt()
		id := readInt()

		if kind == 1 {
			// Friend becomes online
			// Problem guarantees friend wasn't online before
			online[id] = true
			tree.update(rank[id], 1)
		} else {
			// Check if displayed
			if !online[id] {
				writer.WriteString("NO\n")
			} else {
				// Calculate number of online friends with better or equal score
				// This corresponds to finding the sum in BIT up to the friend's rank
				currentRank := tree.query(rank[id])
				if currentRank <= k {
					writer.WriteString("YES\n")
				} else {
					writer.WriteString("NO\n")
				}
			}
		}
	}
}
```