矩形覆盖

#include <iostream>
using namespace std;

int rectCover(int n)
{
if(n < 1)
{
cout<<"error"<<endl;
return -1;
}
if(1 == n)
return 1;
else if(2 == n)
return 2;
else
return rectCover(n-1) + rectCover(n-2);
}

int main()
{
int  n;
cout<<"input n: ";
cin>>n;
cout<<rectCover(n)<<endl;
return 0;
}