For problem statement at 2000-2999/2100-2199/2160-2169/2163/problemA.txt this is a correct solution, but verifier at 2000-2999/2100-2199/2160-2169/2163/verifierA.go ends with All 46 tests passed. can you fix the verifier? package main

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

func main() {
	in := bufio.NewReaderSize(os.Stdin, 1<<20)
	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	defer out.Flush()

	var t int
	fmt.Fscan(in, &t)
	for ; t > 0; t-- {
		var n int
		fmt.Fscan(in, &n)
		a := make([]int, n)
		for i := 0; i < n; i++ {
			fmt.Fscan(in, &a[i])
		}
		sort.Ints(a)
		ok := true
		for i := 1; i+1 < n; i += 2 {
			if a[i] != a[i+1] {
				ok = false
				break
			}
		}
		if ok {
			fmt.Fprintln(out, "YES")
		} else {
			fmt.Fprintln(out, "NO")
		}
	}
}