扫雷 C++

#include <iostream>
#include <cmath>
#include <algorithm>
#include <vector>

using namespace std;

char a[105][105], b[105][105];

int main(){
    int n, m;
    cin >> n >> m;
    getchar();
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < m; ++j){
            cin >> a[i][j];
        }
        getchar();
    }
    for(int i = 0; i < n; ++i){
        for(int j = 0; j < m; ++j){
            int cnt = 0;
            if(a[i][j] == '*') b[i][j] = '*';
            else{
                if(i > 0 && j > 0 && a[i - 1][j - 1] == '*') ++cnt;
                if(i > 0 && a[i - 1][j] == '*') ++cnt;
                if(i > 0 && j + 1 < m && a[i - 1][j + 1] == '*') ++cnt;
                if(j > 0 && a[i][j - 1] == '*') ++cnt;
                if(j + 1 < m && a[i][j + 1] == '*') ++cnt;
                if(i + 1 < n && j > 0 && a[i + 1][j - 1] == '*') ++cnt;
                if(i + 1 < n && a[i + 1][j] == '*') ++cnt;
                if(i + 1 < n && j + 1 < m && a[i + 1][j + 1] == '*') ++cnt;
                b[i][j] = cnt + '0';
            }
            cout << b[i][j];
        }   
        cout << endl;
    }
    return 0;
}