QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#188340 | #5749. Directed Vertex Cacti | qzez | AC ✓ | 9ms | 3716kb | C++14 | 934b | 2023-09-25 19:12:27 | 2023-09-25 19:12:28 |
Judging History
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"