For problem statement at 1000-1999/1700-1799/1700-1709/1700/problemE.txt this is a correct solution, but verifier at 1000-1999/1700-1799/1700-1709/1700/verifierE.go ends with Test 1 failed
Input:
2 3
6 3 1
5 2 4
Expected:
1 3
Got:
1 5

exit status 1 can you fix the verifier? ```go
package main

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

func readInt(reader *bufio.Reader) int {
	var res int
	var sign int = 1
	for {
		c, err := reader.ReadByte()
		if err != nil {
			break
		}
		if c == '-' {
			sign = -1
			continue
		}
		if c >= '0' && c <= '9' {
			res = int(c - '0')
			break
		}
	}
	for {
		c, err := reader.ReadByte()
		if err != nil || c < '0' || c > '9' {
			break
		}
		res = res*10 + int(c-'0')
	}
	return res * sign
}

func main() {
	reader := bufio.NewReader(os.Stdin)
	n := readInt(reader)
	if n == 0 {
		return
	}
	m := readInt(reader)

	nm := n * m
	grid := make([]int, nm)
	for i := 0; i < nm; i++ {
		grid[i] = readInt(reader)
	}

	adj := make([][]int, nm)
	for i := 0; i < nm; i++ {
		r := i / m
		c := i % m
		if r > 0 {
			adj[i] = append(adj[i], i-m)
		}
		if r < n-1 {
			adj[i] = append(adj[i], i+m)
		}
		if c > 0 {
			adj[i] = append(adj[i], i-1)
		}
		if c < m-1 {
			adj[i] = append(adj[i], i+1)
		}
	}

	isBad := func(i int) bool {
		if grid[i] == 1 {
			return false
		}
		for _, nbr := range adj[i] {
			if grid[nbr] < grid[i] {
				return false
			}
		}
		return true
	}

	badCount := 0
	var badCells []int
	for i := 0; i < nm; i++ {
		if isBad(i) {
			badCells = append(badCells, i)
			badCount++
		}
	}

	if badCount == 0 {
		fmt.Println(0)
		return
	}

	firstBad := badCells[0]
	cand := []int{firstBad}
	cand = append(cand, adj[firstBad]...)

	inCand := make(map[int]bool)
	var uniqueCand []int
	for _, c := range cand {
		if !inCand[c] {
			inCand[c] = true
			uniqueCand = append(uniqueCand, c)
		}
	}

	var validSwaps []int64
	visited := make([]int, nm)
	visitToken := 0
	S := make([]int, 0, 10)

	for _, a := range uniqueCand {
		for b := 0; b < nm; b++ {
			if a == b {
				continue
			}

			S = S[:0]
			visitToken++

			add := func(x int) {
				if visited[x] != visitToken {
					visited[x] = visitToken
					S = append(S, x)
				}
			}

			add(a)
			add(b)
			for _, nbr := range adj[a] {
				add(nbr)
			}
			for _, nbr := range adj[b] {
				add(nbr)
			}

			badBefore := 0
			for _, x := range S {
				if isBad(x) {
					badBefore++
				}
			}

			grid[a], grid[b] = grid[b], grid[a]

			badAfter := 0
			for _, x := range S {
				if isBad(x) {
					badAfter++
				}
			}

			grid[a], grid[b] = grid[b], grid[a]

			if badCount-badBefore+badAfter == 0 {
				u, v := a, b
				if u > v {
					u, v = v, u
				}
				validSwaps = append(validSwaps, int64(u)*int64(nm)+int64(v))
			}
		}
	}

	if len(validSwaps) > 0 {
		sort.Slice(validSwaps, func(i, j int) bool {
			return validSwaps[i] < validSwaps[j]
		})
		uniqueCount := 1
		for i := 1; i < len(validSwaps); i++ {
			if validSwaps[i] != validSwaps[i-1] {
				uniqueCount++
			}
		}
		fmt.Printf("1 %d\n", uniqueCount)
	} else {
		fmt.Println(2)
	}
}
```