QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#207163 | #5749. Directed Vertex Cacti | c20230507 | AC ✓ | 107ms | 19352kb | C++14 | 799b | 2023-10-08 10:37:41 | 2023-10-08 10:37:42 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
const int maxn=1e6+10;
const int INF=0x3f3f3f3f;
const int mod=1e9+9;
int n,m,f[maxn],inv[maxn];
int qpow(int x,int y){
int val=1;
while(y){
if(y&1)val=val*x%mod;
x=x*x%mod,y/=2;
}
return val;
}
int C(int x,int y){
int v=1;
for(int i=x;i>x-y;i--)v=v*i%mod;
for(int i=y;i>=1;i--)v=v*qpow(i,mod-2)%mod;
return v;
}
signed main(){
std::ios::sync_with_stdio(false);
cin.tie(0),cout.tie(0);
cin>>n>>m;
int mx=max(n,m);
f[0]=1;
for(int i=1;i<=mx;i++)f[i]=f[i-1]*i%mod;
inv[mx]=qpow(f[mx],mod-2);
for(int i=mx-1;i>=0;i--)inv[i]=inv[i+1]*(i+1);
int ans=f[n]%mod;
ans=ans*C(C(n,2),m)%mod;
cout<<ans;
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 5728kb
input:
3 1
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5724kb
input:
4 4
output:
360
result:
ok 1 number(s): "360"
Test #3:
score: 0
Accepted
time: 35ms
memory: 13636kb
input:
39847 348708
output:
983575456
result:
ok 1 number(s): "983575456"
Test #4:
score: 0
Accepted
time: 0ms
memory: 5792kb
input:
1 1
output:
0
result:
ok 1 number(s): "0"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5736kb
input:
3 2
output:
18
result:
ok 1 number(s): "18"
Test #6:
score: 0
Accepted
time: 1ms
memory: 5732kb
input:
3 3
output:
6
result:
ok 1 number(s): "6"
Test #7:
score: 0
Accepted
time: 1ms
memory: 5720kb
input:
3 4
output:
0
result:
ok 1 number(s): "0"
Test #8:
score: 0
Accepted
time: 107ms
memory: 19352kb
input:
3 1000000
output:
0
result:
ok 1 number(s): "0"
Test #9:
score: 0
Accepted
time: 1ms
memory: 5720kb
input:
4 1
output:
144
result:
ok 1 number(s): "144"
Test #10:
score: 0
Accepted
time: 1ms
memory: 5732kb
input:
4 2
output:
360
result:
ok 1 number(s): "360"
Test #11:
score: 0
Accepted
time: 1ms
memory: 5704kb
input:
4 3
output:
480
result:
ok 1 number(s): "480"
Test #12:
score: 0
Accepted
time: 1ms
memory: 5736kb
input:
4 5
output:
144
result:
ok 1 number(s): "144"
Test #13:
score: 0
Accepted
time: 1ms
memory: 5776kb
input:
4 6
output:
24
result:
ok 1 number(s): "24"
Test #14:
score: 0
Accepted
time: 0ms
memory: 5656kb
input:
5 1
output:
1200
result:
ok 1 number(s): "1200"
Test #15:
score: 0
Accepted
time: 0ms
memory: 5708kb
input:
5 2
output:
5400
result:
ok 1 number(s): "5400"
Test #16:
score: 0
Accepted
time: 1ms
memory: 5732kb
input:
5 3
output:
14400
result:
ok 1 number(s): "14400"
Test #17:
score: 0
Accepted
time: 1ms
memory: 5656kb
input:
5 4
output:
25200
result:
ok 1 number(s): "25200"
Test #18:
score: 0
Accepted
time: 1ms
memory: 5708kb
input:
5 5
output:
30240
result:
ok 1 number(s): "30240"
Test #19:
score: 0
Accepted
time: 1ms
memory: 5736kb
input:
5 6
output:
25200
result:
ok 1 number(s): "25200"
Test #20:
score: 0
Accepted
time: 0ms
memory: 5736kb
input:
5 7
output:
14400
result:
ok 1 number(s): "14400"
Test #21:
score: 0
Accepted
time: 0ms
memory: 5724kb
input:
5 8
output:
5400
result:
ok 1 number(s): "5400"
Test #22:
score: 0
Accepted
time: 1ms
memory: 5788kb
input:
5 9
output:
1200
result:
ok 1 number(s): "1200"
Test #23:
score: 0
Accepted
time: 1ms
memory: 5728kb
input:
5 10
output:
120
result:
ok 1 number(s): "120"
Test #24:
score: 0
Accepted
time: 1ms
memory: 5728kb
input:
1000 1
output:
533396879
result:
ok 1 number(s): "533396879"
Test #25:
score: 0
Accepted
time: 1ms
memory: 5728kb
input:
1000 100
output:
199484478
result:
ok 1 number(s): "199484478"
Test #26:
score: 0
Accepted
time: 2ms
memory: 5732kb
input:
1000 10000
output:
656650652
result:
ok 1 number(s): "656650652"
Test #27:
score: 0
Accepted
time: 103ms
memory: 19348kb
input:
1000 1000000
output:
0
result:
ok 1 number(s): "0"
Test #28:
score: 0
Accepted
time: 63ms
memory: 16452kb
input:
535164 619302
output:
721871396
result:
ok 1 number(s): "721871396"
Test #29:
score: 0
Accepted
time: 104ms
memory: 19348kb
input:
1000000 1000000
output:
580712335
result:
ok 1 number(s): "580712335"
Test #30:
score: 0
Accepted
time: 24ms
memory: 19348kb
input:
1000000 234534
output:
546630669
result:
ok 1 number(s): "546630669"
Test #31:
score: 0
Accepted
time: 104ms
memory: 19236kb
input:
234523 1000000
output:
127869098
result:
ok 1 number(s): "127869098"
Test #32:
score: 0
Accepted
time: 0ms
memory: 8176kb
input:
44722 10000
output:
0
result:
ok 1 number(s): "0"