Why it is all WA ?!

#include <bits/stdc++.h>
using namespace std;
char a[10001][10001],tot=0;
int n,x,k,m;
int main() {
    cin>>n>>m;
    int z=n*m;
    for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    		cin>>a[i][j];
    		
		}
	}
	for(int i=1;i<=n;i++){
    	for(int j=1;j<=m;j++){
    		x=0;
       		if(a[i][j]=='#'){
    			if(i<n&&a[i+1][j]=='.'){
    				x++;
    				//cout<<1;
				}
				if(i>1&&a[i-1][j]=='.'){
					x++;
					//cout<<2;
				}
				if(j<m&&a[i][j+1]=='.'){
					x++;
					//cout<<3;
				}
				if(j>1&&a[i][j-1]=='.'){
					x++;
					//cout<<4;
				}
			}
			k=max(x,k);
			z-=x;
            if(x>=1){
                z--;
            }
    		//cout<<x;
		}
	}
	if(k>=1)
		cout<<z+k+1;
	else
		cout<<z;
    return 0;
}/*

x=0;
       		if(a[i][j]=='#'){
    			if(a[i+1][j]=='.'){
    				x++;
    				cout<<1;
				}
				if(a[i-1][j]=='.'){
					x++;
					cout<<2;
				}
				if(a[i][j+1]=='.'){
					x++;
					cout<<3;
				}
				if(a[i][j-1]=='.'){
					x++;
					cout<<4;
				}
			}
			k=max(x,k);
			z-=x;
*/