codeforce - Cakeminator

#include<bits/stdc++.h>
using namespace std;
#define fastread()(ios_base::sync_with_stdio(false),cin.tie(NULL));
int main()
{
    int m,n,rc=0,cc=0;
    cin>>m>>n;
    int row[m+1],clm[n+1];
    memset(row,0,sizeof(row));
    memset(clm,0,sizeof(clm));
    for(int i=0;i<m;i++)
    {
        for(int j=0;j<n;j++)
        {
            char s;
            cin>>s;
            if(s!='.')
            {
                if(row[i]==0)
                {
                    rc++;
                    row[i]=1;
                }
                if(clm[j]==0)
                {
                    cc++;
                    clm[j]=1;
                }
            }
        }
    }
   // cout<<rc<<" "<<cc<<endl;
    /*if(rc*cc>m*n)
    {
        printf("0\n");
        return 0;
    }*/
    printf("%d\n",m*n-rc*cc);
}