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#include <vector>

#include <list>

#include <map>

#include <set>

#include <deque>

#include <stack>

#include <bitset>

#include <algorithm>

#include <functional>

#include <numeric>

#include <utility>

#include <sstream>

#include <iostream>

#include <iomanip>

#include <cstdio>

#include <cmath>

#include <cstdlib>

#include <ctime>

using namespace std;

class FallingFactorialPower {

public:

double compute(int, int);

};

double FallingFactorialPower::compute(int n, int k) {

double ans = 1;

if(k>0){

for(int i=0; i<=k-1; i++){

ans*=(n-i);

}

return ans;

}else{

k=k*-1;

for(int i=1; i<=k; i++){

ans/=(n+i);

}

return ans;

}

}

double test0() {

int p0 = 7;

int p1 = 3;

FallingFactorialPower * obj = new FallingFactorialPower();

clock_t start = clock();

double my_answer = obj->compute(p0, p1);

clock_t end = clock();

delete obj;

cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;

double p2 = 210.0;

cout <<"Desired answer: " <<endl;

cout <<"\t" << p2 <<endl;

cout <<"Your answer: " <<endl;

cout <<"\t" << my_answer <<endl;

if (p2 != my_answer) {

cout <<"DOESN'T MATCH!!!!" <<endl <<endl;

return -1;

}

else {

cout <<"Match :-)" <<endl <<endl;

return (double)(end-start)/CLOCKS_PER_SEC;

}

}

double test1() {

int p0 = 10;

int p1 = 1;

FallingFactorialPower * obj = new FallingFactorialPower();

clock_t start = clock();

double my_answer = obj->compute(p0, p1);

clock_t end = clock();

delete obj;

cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;

double p2 = 10.0;

cout <<"Desired answer: " <<endl;

cout <<"\t" << p2 <<endl;

cout <<"Your answer: " <<endl;

cout <<"\t" << my_answer <<endl;

if (p2 != my_answer) {

cout <<"DOESN'T MATCH!!!!" <<endl <<endl;

return -1;

}

else {

cout <<"Match :-)" <<endl <<endl;

return (double)(end-start)/CLOCKS_PER_SEC;

}

}

double test2() {

int p0 = 5;

int p1 = 0;

FallingFactorialPower * obj = new FallingFactorialPower();

clock_t start = clock();

double my_answer = obj->compute(p0, p1);

clock_t end = clock();

delete obj;

cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;

double p2 = 1.0;

cout <<"Desired answer: " <<endl;

cout <<"\t" << p2 <<endl;

cout <<"Your answer: " <<endl;

cout <<"\t" << my_answer <<endl;

if (p2 != my_answer) {

cout <<"DOESN'T MATCH!!!!" <<endl <<endl;

return -1;

}

else {

cout <<"Match :-)" <<endl <<endl;

return (double)(end-start)/CLOCKS_PER_SEC;

}

}

double test3() {

int p0 = 3;

int p1 = -1;

FallingFactorialPower * obj = new FallingFactorialPower();

clock_t start = clock();

double my_answer = obj->compute(p0, p1);

clock_t end = clock();

delete obj;

cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;

double p2 = 0.25;

cout <<"Desired answer: " <<endl;

cout <<"\t" << p2 <<endl;

cout <<"Your answer: " <<endl;

cout <<"\t" << my_answer <<endl;

if (p2 != my_answer) {

cout <<"DOESN'T MATCH!!!!" <<endl <<endl;

return -1;

}

else {

cout <<"Match :-)" <<endl <<endl;

return (double)(end-start)/CLOCKS_PER_SEC;

}

}

double test4() {

int p0 = 2;

int p1 = -3;

FallingFactorialPower * obj = new FallingFactorialPower();

clock_t start = clock();

double my_answer = obj->compute(p0, p1);

clock_t end = clock();

delete obj;

cout <<"Time: " <<(double)(end-start)/CLOCKS_PER_SEC <<" seconds" <<endl;

double p2 = 0.016666666666666666;

cout <<"Desired answer: " <<endl;

cout <<"\t" << p2 <<endl;

cout <<"Your answer: " <<endl;

cout <<"\t" << my_answer <<endl;

if (p2 != my_answer) {

cout <<"DOESN'T MATCH!!!!" <<endl <<endl;

return -1;

}

else {

cout <<"Match :-)" <<endl <<endl;

return (double)(end-start)/CLOCKS_PER_SEC;

}

}

int main() {

int time;

bool errors = false;

time = test0();

if (time < 0)

errors = true;

time = test1();

if (time < 0)

errors = true;

time = test2();

if (time < 0)

errors = true;

time = test3();

if (time < 0)

errors = true;

time = test4();

if (time < 0)

errors = true;

if (!errors)

cout <<"You're a stud (at least on the example cases)!" <<endl;

else

cout <<"Some of the test cases had errors." <<endl;

}