For problem statement at 1000-1999/1700-1799/1720-1729/1720/problemC.txt this is a correct solution, but verifier at 1000-1999/1700-1799/1720-1729/1720/verifierC.go ends with All tests passed can you fix the verifier? package main

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

func main() {
	reader := bufio.NewReader(os.Stdin)
	var t int
	fmt.Fscan(reader, &t)

	for i := 0; i < t; i++ {
		var n, m int
		fmt.Fscan(reader, &n, &m)

		matrix := make([]string, n)
		totalOnes := 0
		for j := 0; j < n; j++ {
			fmt.Fscan(reader, &matrix[j])
			for k := 0; k < m; k++ {
				if matrix[j][k] == '1' {
					totalOnes++
				}
			}
		}

		if totalOnes == 0 {
			fmt.Println(0)
			continue
		}

		minOnes := 4
		for j := 0; j < n-1; j++ {
			for k := 0; k < m-1; k++ {
				ones := 0
				if matrix[j][k] == '1' {
					ones++
				}
				if matrix[j+1][k] == '1' {
					ones++
				}
				if matrix[j][k+1] == '1' {
					ones++
				}
				if matrix[j+1][k+1] == '1' {
					ones++
				}
				if ones < minOnes {
					minOnes = ones
				}
			}
		}

		if minOnes <= 2 {
			fmt.Println(totalOnes)
		} else if minOnes == 3 {
			fmt.Println(totalOnes - 1)
		} else {
			fmt.Println(totalOnes - 2)
		}
	}
}