UVA-10499 the Land of Justice

Click to open link

This problem means one by one solid ball, and then it is divided into n parts along the axis, asked later surface area than the original increase of a few percent.

The initial surface area of 4XPIXRXR was divided into 2 parts, the surface area increased 2xpi*r*r, so is 50%, divided into three parts of the surface area increased 3xpixr*r. So it's 75%,n to increase the 25xn%.

Use double to prevent overflow.

#include <cstdio>
int main ()
{
    double n;
    while (~SCANF ("%lf", &n) &&n>0)
    {
        if (n==1) printf ("0%%\n");
        else printf ("%.0lf%%\n", 25*n);
    }
    return 0;
}