Artifact ec3c7b925e5f4d41117bc3f12ccac0110e724566
#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>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;
class FoxMakingDice { public:
long long theCount(int N, int K)
{
LL cnt = 0;
for(int sum=K; sum<=N+N; ++sum)
{
LL v = 0;
for(int s=1; s<=N; ++s)
if( s<sum-s && 1<=sum-s && sum-s<=N )
++v;
cnt += v*(v-1)*(v-2)/6*2;
}
return cnt;
}
};
// 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(_, FoxMakingDice().theCount(N, K));}
int main(){
CASE(0)
int N = 6;
int K = 7;
long long _ = 2LL;
END
CASE(1)
int N = 5;
int K = 7;
long long _ = 0LL;
END
CASE(2)
int N = 1000;
int K = 1;
long long _ = 20625666000LL;
END
CASE(3)
int N = 456;
int K = 123;
long long _ = 879075732LL;
END
CASE(4)
int N = 913;
int K = 1014;
long long _ = 4506149340LL;
END
CASE(5)
int N = 1000;
int K = 2000;
long long _ = -1LL;
END
CASE(6)
int N = 1;
int K = 7;
long long _ = 0LL;
END
CASE(6)
int N = 2;
int K = 7;
long long _ = 0LL;
END
CASE(6)
int N = 3;
int K = 7;
long long _ = 0LL;
END
CASE(6)
int N = 4;
int K = 7;
long long _ = 0LL;
END
CASE(6)
int N = 5;
int K = 7;
long long _ = 0LL;
END
}
// END CUT HERE