For problem statement at 0-999/300-399/340-349/340/problemC.txt this is a correct solution, but verifier at 0-999/300-399/340-349/340/verifierC.go ends with All tests passed can you fix the verifier? package main

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

type FastScanner struct {
	r *bufio.Reader
}

func (fs *FastScanner) NextInt() int {
	sign, val := 1, 0
	c, _ := fs.r.ReadByte()
	for (c < '0' || c > '9') && c != '-' {
		c, _ = fs.r.ReadByte()
	}
	if c == '-' {
		sign = -1
		c, _ = fs.r.ReadByte()
	}
	for c >= '0' && c <= '9' {
		val = val*10 + int(c-'0')
		c, _ = fs.r.ReadByte()
	}
	fs.r.UnreadByte()
	return sign * val
}

func gcd(a, b int64) int64 {
	for b != 0 {
		a, b = b, a%b
	}
	return a
}

func main() {
	fs := &FastScanner{r: bufio.NewReaderSize(os.Stdin, 1<<20)}
	n := fs.NextInt()
	a := make([]int, n)
	for i := 0; i < n; i++ {
		a[i] = fs.NextInt()
	}

	sort.Ints(a)

	var prefix, pair int64
	for i, v := range a {
		x := int64(v)
		pair += x*int64(i) - prefix
		prefix += x
	}

	num := prefix + 2*pair
	den := int64(n)
	g := gcd(num, den)

	w := bufio.NewWriterSize(os.Stdout, 1<<20)
	fmt.Fprintf(w, "%d %d", num/g, den/g)
	w.Flush()
}