poj 1730 Perfect Pth Powers

#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>#include <cmath>using namespace std;#define eps 1.0e-12long long n;void work(){    bool fu =false;    if (n <0)    {        fu =true;        n =-n;    }    for (int i =32; i >=1; i--)        if (!fu || (fu && (i &1)))        { double a = pow(double(n), 1.0/ i); long long x = a; if (abs(a - x) < eps || abs(a - x -1) < eps) {     printf("%dn", i);     return; }        }}int main(){    while (scanf("%lld", &n), n)        work();    return 0;}