Cantor 的数表

#include <stdio.h>
#include <math.h>
int main()
{
    int n;
    while(scanf("%d",&n)==1)
    {
        int k =(int)floor((sqrt(8.0*n+1)-1)/2-1e-9)+1;
        int s = k*(k+1)/2;
        printf("%d/%d\n",s-n+1,k-s+n);
    }
}