Artifact ada6668a1964faead918a6c1fadb5ebcffee84df
#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
#ifdef __GNUC__
#include <ext/hash_map>
#define unordered_map __gnu_cxx::hash_map
#else
#include <unordered_map>
#endif
using namespace std;
typedef long long LL;
typedef complex<double> CMP;
class EllysFractions { public:
long long getCount(int N)
{
LL total = 0;
for(int k=2; k<=N; ++k)
total += getExact(k);
return total;
}
LL getExact(int N)
{
int np = 0;
for(int p=2; p<=N; ++p)
if(is_prime(p))
++np;
LL v = 1;
for(int i=0; i<np; ++i)
v *= 2;
return v/2;
}
bool is_prime(int n)
{
for(int k=2; k<n; ++k)
if(n%k == 0)
return false;
return true;
}
};
// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
{ ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
{ os << "{ ";
for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const long long& Expected, const long long& Received) {
bool ok = (Expected == Received);
if(ok) cerr << "PASSED" << timer() << endl; else { cerr << "FAILED" << timer() << endl;
cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END verify_case(_, EllysFractions().getCount(N));}
int main(){
CASE(0)
int N = 1;
long long _ = 0LL;
END
CASE(1)
int N = 2;
long long _ = 1LL;
END
CASE(2)
int N = 3;
long long _ = 3LL;
END
CASE(3)
int N = 5;
long long _ = 9LL;
END
CASE(4)
int N = 100;
long long _ = 177431885LL;
END
CASE(5)
int N = 250;
long long _ = -1LL;
END
CASE(6)
int N = 4;
long long _ = 5LL;
END
}
// END CUT HERE