代码爆炸求助><……

#include <bits/stdc++.h>
using namespace std;
char a[105][105];
int main (){
    int n,m,tmp=0;
    cin>>n>>m;
    for(int i=0;i<m;i++){
    	for(int j=0;j<n;j++){
    		cin>>a[i][j];
			if(a[i][j]=='*'){
			 a[i+1][j]++;
			 a[i+1][j+1]++;
			 a[i-1][j-1]++;
			 a[i-1][j]++;
			 a[i][j-1]++;
			 a[i][j+1]++;
			 a[i+1][j-1]++;
			 a[i-1][j+1]++;
		 	}
		}
	}
	for(int i=0;i<m;i++){
		for(int j=0;j<n;j++){
			if(a[i][j]=='*') cout<<'*';
			else cout<<a[i][j];
		}
	}
    return 0;
}