QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#188340#5749. Directed Vertex CactiqzezAC ✓9ms3716kbC++14934b2023-09-25 19:12:272023-09-25 19:12:28

Judging History

你现在查看的是最新测评结果

  • [2023-09-25 19:12:28]
  • 评测
  • 测评结果:AC
  • 用时:9ms
  • 内存:3716kb
  • [2023-09-25 19:12:27]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;
using ll=long long;
template<typename T>
ostream& operator << (ostream &out,const vector<T>&x){
	if(x.empty())return out<<"[]";
	out<<'['<<x[0];
	for(int len=x.size(),i=1;i<len;i++)out<<','<<x[i];
	return out<<']';
}
template<typename T>
vector<T> ary(const T *a,int l,int r){
	return vector<T>{a+l,a+1+r};
}
template<typename T>
void debug(T x){
	cerr<<x<<'\n';
}
template<typename T,typename ...S>
void debug(T x,S ...y){
	cerr<<x<<' ',debug(y...);
}
const int mod=1e9+9;
int n,m;
ll qpow(ll x,ll y=mod-2,ll ans=1){
	for(;y;(x*=x)%=mod,y>>=1)if(y&1)(ans*=x)%=mod;
	return ans;
}
int C(ll n,int m){
	if(0>m||m>n)return 0;
	int a=1,b=1;
	for(int i=0;i<m;i++){
		a=(n-i)%mod*a%mod,b=b*(i+1ll)%mod;
	}
	return a*qpow(b)%mod;
}
int main(){
	cin>>n>>m;
	int ans=C(n*(n-1ll)/2,m);
	for(int i=1;i<=n;i++)ans=1ll*ans*i%mod;
	cout<<ans<<endl;
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3576kb

input:

3 1

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3664kb

input:

4 4

output:

360

result:

ok 1 number(s): "360"

Test #3:

score: 0
Accepted
time: 2ms
memory: 3696kb

input:

39847 348708

output:

983575456

result:

ok 1 number(s): "983575456"

Test #4:

score: 0
Accepted
time: 0ms
memory: 3688kb

input:

1 1

output:

0

result:

ok 1 number(s): "0"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3604kb

input:

3 2

output:

18

result:

ok 1 number(s): "18"

Test #6:

score: 0
Accepted
time: 0ms
memory: 3552kb

input:

3 3

output:

6

result:

ok 1 number(s): "6"

Test #7:

score: 0
Accepted
time: 0ms
memory: 3568kb

input:

3 4

output:

0

result:

ok 1 number(s): "0"

Test #8:

score: 0
Accepted
time: 0ms
memory: 3688kb

input:

3 1000000

output:

0

result:

ok 1 number(s): "0"

Test #9:

score: 0
Accepted
time: 0ms
memory: 3632kb

input:

4 1

output:

144

result:

ok 1 number(s): "144"

Test #10:

score: 0
Accepted
time: 0ms
memory: 3692kb

input:

4 2

output:

360

result:

ok 1 number(s): "360"

Test #11:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

4 3

output:

480

result:

ok 1 number(s): "480"

Test #12:

score: 0
Accepted
time: 0ms
memory: 3632kb

input:

4 5

output:

144

result:

ok 1 number(s): "144"

Test #13:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

4 6

output:

24

result:

ok 1 number(s): "24"

Test #14:

score: 0
Accepted
time: 0ms
memory: 3644kb

input:

5 1

output:

1200

result:

ok 1 number(s): "1200"

Test #15:

score: 0
Accepted
time: 0ms
memory: 3696kb

input:

5 2

output:

5400

result:

ok 1 number(s): "5400"

Test #16:

score: 0
Accepted
time: 0ms
memory: 3716kb

input:

5 3

output:

14400

result:

ok 1 number(s): "14400"

Test #17:

score: 0
Accepted
time: 0ms
memory: 3648kb

input:

5 4

output:

25200

result:

ok 1 number(s): "25200"

Test #18:

score: 0
Accepted
time: 0ms
memory: 3688kb

input:

5 5

output:

30240

result:

ok 1 number(s): "30240"

Test #19:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

5 6

output:

25200

result:

ok 1 number(s): "25200"

Test #20:

score: 0
Accepted
time: 0ms
memory: 3632kb

input:

5 7

output:

14400

result:

ok 1 number(s): "14400"

Test #21:

score: 0
Accepted
time: 0ms
memory: 3628kb

input:

5 8

output:

5400

result:

ok 1 number(s): "5400"

Test #22:

score: 0
Accepted
time: 0ms
memory: 3508kb

input:

5 9

output:

1200

result:

ok 1 number(s): "1200"

Test #23:

score: 0
Accepted
time: 0ms
memory: 3560kb

input:

5 10

output:

120

result:

ok 1 number(s): "120"

Test #24:

score: 0
Accepted
time: 0ms
memory: 3512kb

input:

1000 1

output:

533396879

result:

ok 1 number(s): "533396879"

Test #25:

score: 0
Accepted
time: 0ms
memory: 3688kb

input:

1000 100

output:

199484478

result:

ok 1 number(s): "199484478"

Test #26:

score: 0
Accepted
time: 0ms
memory: 3636kb

input:

1000 10000

output:

656650652

result:

ok 1 number(s): "656650652"

Test #27:

score: 0
Accepted
time: 0ms
memory: 3528kb

input:

1000 1000000

output:

0

result:

ok 1 number(s): "0"

Test #28:

score: 0
Accepted
time: 3ms
memory: 3700kb

input:

535164 619302

output:

721871396

result:

ok 1 number(s): "721871396"

Test #29:

score: 0
Accepted
time: 9ms
memory: 3632kb

input:

1000000 1000000

output:

580712335

result:

ok 1 number(s): "580712335"

Test #30:

score: 0
Accepted
time: 6ms
memory: 3632kb

input:

1000000 234534

output:

546630669

result:

ok 1 number(s): "546630669"

Test #31:

score: 0
Accepted
time: 6ms
memory: 3688kb

input:

234523 1000000

output:

127869098

result:

ok 1 number(s): "127869098"

Test #32:

score: 0
Accepted
time: 1ms
memory: 3604kb

input:

44722 10000

output:

0

result:

ok 1 number(s): "0"