For problem statement at 1000-1999/1800-1899/1800-1809/1808/problemB.txt this is a correct solution, but verifier at 1000-1999/1800-1899/1800-1809/1808/verifierB.go ends with All tests passed can you fix the verifier? ```go
package main

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

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

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

	if !scanner.Scan() {
		return
	}
	t, _ := strconv.Atoi(scanner.Text())

	for i := 0; i < t; i++ {
		n := scanInt()
		m := scanInt()

		cols := make([][]int, m)
		for j := 0; j < m; j++ {
			cols[j] = make([]int, n)
		}

		for r := 0; r < n; r++ {
			for c := 0; c < m; c++ {
				cols[c][r] = scanInt()
			}
		}

		var totalWinnings int64 = 0

		for c := 0; c < m; c++ {
			col := cols[c]
			sort.Ints(col)

			var currentPrefixSum int64 = 0
			for r := 0; r < n; r++ {
				val := int64(col[r])
				totalWinnings += (int64(r)*val - currentPrefixSum)
				currentPrefixSum += val
			}
		}

		fmt.Fprintln(writer, totalWinnings)
	}
}
```