For problem statement at 1000-1999/1900-1999/1920-1929/1926/problemD.txt this is a correct solution, but verifier at 1000-1999/1900-1999/1920-1929/1926/verifierD.go ends with ok can you fix the verifier? ```go
package main

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

type FastReader struct {
	r *bufio.Reader
}

func NewFastReader() *FastReader {
	return &FastReader{r: bufio.NewReaderSize(os.Stdin, 1<<20)}
}

func (fr *FastReader) NextInt() int64 {
	var sign int64 = 1
	var val int64 = 0
	c, err := fr.r.ReadByte()
	for (c < '0' || c > '9') && c != '-' {
		if err != nil {
			return 0
		}
		c, err = fr.r.ReadByte()
	}
	if c == '-' {
		sign = -1
		c, err = fr.r.ReadByte()
	}
	for c >= '0' && c <= '9' {
		val = val*10 + int64(c-'0')
		c, err = fr.r.ReadByte()
		if err != nil {
			break
		}
	}
	return val * sign
}

func main() {
	fr := NewFastReader()
	out := bufio.NewWriterSize(os.Stdout, 1<<20)
	defer out.Flush()

	t := int(fr.NextInt())
	mask := (uint32(1) << 31) - 1

	for ; t > 0; t-- {
		n := int(fr.NextInt())
		cnt := make(map[uint32]int, n*2)
		for i := 0; i < n; i++ {
			x := uint32(fr.NextInt())
			cnt[x]++
		}
		pairs := 0
		for v, cv := range cnt {
			c := mask ^ v
			if v < c {
				cc := cnt[c]
				if cv < cc {
					pairs += cv
				} else {
					pairs += cc
				}
			}
		}
		fmt.Fprintln(out, n-pairs)
	}
}
```