For problem statement at 1000-1999/1900-1999/1990-1999/1990/problemA.txt this is a correct solution, but verifier at 1000-1999/1900-1999/1990-1999/1990/verifierA.go ends with runtime error: exit status 2

exit status 1 can you fix the verifier? package main

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

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)
		freq := make([]int, n+1)
		for i := 0; i < n; i++ {
			var x int
			fmt.Fscan(in, &x)
			freq[x]++
		}
		win := false
		for i := 1; i <= n; i++ {
			if freq[i]%2 == 1 {
				win = true
				break
			}
		}
		if win {
			fmt.Fprintln(out, "YES")
		} else {
			fmt.Fprintln(out, "NO")
		}
	}
}