题解 | 扫雷

package main

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

func main() {
	sc := bufio.NewScanner(os.Stdin)
	sc.Scan()

	nm := strings.Fields(sc.Text())
	n, _ := strconv.Atoi(nm[0])
	m, _ := strconv.Atoi(nm[1])


	grid := make([][]byte, n+2)
	for i := range grid {
		grid[i] = make([]byte, m+2)
	}


	for i := 1; i <= n; i++ {
		sc.Scan()
		line := sc.Text()
		for j := 1; j <= m; j++ {
			grid[i][j] = line[j-1]
		}
	}

	dirs := [][]int{{-1, -1}, {-1, 0}, {-1, 1},
		{0, -1},          {0, 1},
		{1, -1},  {1, 0}, {1, 1}}


	for i := 1; i <= n; i++ {
		for j := 1; j <= m; j++ {
			if grid[i][j] == '*' {
				continue 
			}
			count := 0
			
			for _, d := range dirs {
				x, y := i+d[0], j+d[1]
				if grid[x][y] == '*' {
					count++
				}
			}
			
			grid[i][j] = byte('0' + count)
		}
	}

	for i := 1; i <= n; i++ {
		fmt.Println(string(grid[i][1 : m+1]))
	}
}