题解 | 扫雷

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        List<String> s = new ArrayList<String>();
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            s.add(in.nextLine());
            // System.out.println(a + b);
        }
        int a = Integer.valueOf(s.get(0).split(" ")[0]);
        int b = Integer.valueOf(s.get(0).split(" ")[1]);
        s.remove(0);
        char[][] ss = new char[a][b];
        List<String> start = new ArrayList<String>();
        s.forEach(i->{
            start.addAll(Arrays.stream(i.split("")).collect(Collectors.toList()));
        });

        for(int i=0;i<a;i++){
            for(int j =0;j<b;j++){
                ss[i][j] = start.get(i*b+j).charAt(0);
                // System.out.print(ss[i][j]);
            }
        }

        for(int i=0;i<a;i++){
            for(int j =0;j<b;j++){
                if(ss[i][j] != '*'){
                    char x = (char)(count(ss,i,j,a,b)+'0');
                    ss[i][j] = x;
                }
            }
        }

        for(int i=0;i<a;i++){
            for(int j =0;j<b;j++){
                System.out.print(ss[i][j]);
            }
            System.out.println();
        }


    }

    public static int count(char[][] ss,int x,int y,int xl,int yl){
        int count = 0;
        if(x-1>=0 && y-1>=0 && ss[x-1][y-1] == '*'){
            count++;
        }
        if(x-1>=0 && ss[x-1][y] == '*'){
            count++;
        }
        if(x-1>=0 && y+1<yl&& ss[x-1][y+1] == '*'){
            count++;
        }
        if( y-1>=0 && ss[x][y-1] == '*'){
            count++;
        }
        if(y+1<yl&& ss[x][y+1] == '*'){
            count++;
        }
        if(x+1<xl && y-1>=0 && ss[x+1][y-1] == '*'){
            count++;
        }
        if(x+1<xl && ss[x+1][y] == '*'){
            count++;
        }
        if(x+1<xl && y+1<yl&& ss[x+1][y+1] == '*'){
            count++;
        }
        return count;
    }
}