Could anyone tell me what's wrong with my program...I know it's very
simple, evenmore, get WA :(

#include<iostream.h>

#define visited '+'

short N;
int   AofW;
char  lab[35][35];

void scandata()
{
 short i, j;
 cin>>N;
 for (i=0; i<N; i++)
    for (j=0; j<N; j++) cin>>lab[i][j];
}

void visit(short i, short j)
{
 if (i<0 || i==N ||
      j<0 || j==N)
 {
    AofW++;
    return;
 }
 if (lab[i][j]==visited)
        return;
 if (lab[i][j]=='#')
 {
    AofW++;
    return;
 }
 lab[i][j] = visited;
    visit(i+1,j);
    visit(i-1,j);
    visit(i,j+1);
    visit(i,j-1);
}

void processdata()
{
    AofW = 0;
    visit(0,0);
    if (lab[N-1][N-1]==visited)
    {
        if (AofW-4<0) cout<<0<<endl;
             else cout<<((AofW-4)*9)<<endl;
    }
    else
        cout<<0<<endl;
}

void main()
{
    scandata();
    processdata();
}

void processdata()
{
    AofW = 0;
    visit(0,0);
    if (lab[N-1][N-1]!=visited) visit(N-1,N-1);
        cout<<((AofW-4)*9)<<endl;
}

=> ACCEPTED

Thanks a lot xyz!!! :)