UVa 10499-the Land of Justice

Portal UVa 10499-the Land of Justice

Test instructions is the number of blocks that are input to cut a ball, and the percentage of surface area increase is calculated.

when cut into N, increase

Simplification can be.

pay attention to the processing when N=1

ps:actually The clever mathematicians were very much interested to establish their own business.

How do I feel that the author is mocking mathematicians ...

#include <cstdio>
#include <cmath>

using namespace std;

int main ()
{
    double n;
    while (scanf ("%lf", &n) && n >= 0)
    {
        if (n = = 1)
            printf ("0%%\n");
        else
            printf ("%.f%%\n", * * n);
    }
    return 0;
}