QOJ.ac
QOJ
| ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
|---|---|---|---|---|---|---|---|---|---|
| #208645 | #5749. Directed Vertex Cacti | yz_ly | AC ✓ | 22ms | 19348kb | C++14 | 949b | 2023-10-09 19:37:54 | 2023-10-09 19:37:54 |
Judging History
answer
#include<bits/stdc++.h>
#define ll long long
using namespace std;
inline int read(){
char ch=getchar();
int f=1,x=0;
while(ch<'0'||ch>'9'){
if(ch=='-')
f=-f;
ch=getchar();
}
while(ch>='0'&&ch<='9'){
x=x*10+ch-'0';
ch=getchar();
}
return x*f;
}
inline void work(ll k){
if(k<0){
putchar('-');
k=-k;
}
if(k>9)
work(k/10);
putchar(k%10+'0');
}
//不同拓扑序,都有一种定向并加环方案,所以总方案是n!的
//ans=jc[n]*C(C(n,2),m);
const ll mod=1e9+9;
ll n,m,jc[1000005],inv[1000005],ans=1,sum;
int main(){
n=read();
m=read();
jc[0]=inv[0]=inv[1]=1;
for(int i=1;i<=max(n,m);i++){
jc[i]=jc[i-1]*i%mod;
}
for(int i=2;i<=max(n,m);i++){
inv[i]=(mod-mod/i)*inv[mod%i]%mod;
}
for(int i=1;i<=max(n,m);i++){
inv[i]=inv[i-1]*inv[i]%mod;
}
sum=n*(n-1)/2ll;
for(ll i=sum-m+1;i<=sum;i++){
ans=i%mod*ans%mod;
}
work(ans*inv[m]%mod*jc[n]%mod);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 1ms
memory: 5584kb
input:
3 1
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5784kb
input:
4 4
output:
360
result:
ok 1 number(s): "360"
Test #3:
score: 0
Accepted
time: 4ms
memory: 14120kb
input:
39847 348708
output:
983575456
result:
ok 1 number(s): "983575456"
Test #4:
score: 0
Accepted
time: 1ms
memory: 5720kb
input:
1 1
output:
0
result:
ok 1 number(s): "0"
Test #5:
score: 0
Accepted
time: 1ms
memory: 5704kb
input:
3 2
output:
18
result:
ok 1 number(s): "18"
Test #6:
score: 0
Accepted
time: 0ms
memory: 5584kb
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: 17ms
memory: 19216kb
input:
3 1000000
output:
0
result:
ok 1 number(s): "0"
Test #9:
score: 0
Accepted
time: 0ms
memory: 5764kb
input:
4 1
output:
144
result:
ok 1 number(s): "144"
Test #10:
score: 0
Accepted
time: 1ms
memory: 5768kb
input:
4 2
output:
360
result:
ok 1 number(s): "360"
Test #11:
score: 0
Accepted
time: 1ms
memory: 5724kb
input:
4 3
output:
480
result:
ok 1 number(s): "480"
Test #12:
score: 0
Accepted
time: 0ms
memory: 5708kb
input:
4 5
output:
144
result:
ok 1 number(s): "144"
Test #13:
score: 0
Accepted
time: 1ms
memory: 5732kb
input:
4 6
output:
24
result:
ok 1 number(s): "24"
Test #14:
score: 0
Accepted
time: 0ms
memory: 5776kb
input:
5 1
output:
1200
result:
ok 1 number(s): "1200"
Test #15:
score: 0
Accepted
time: 1ms
memory: 5672kb
input:
5 2
output:
5400
result:
ok 1 number(s): "5400"
Test #16:
score: 0
Accepted
time: 1ms
memory: 5720kb
input:
5 3
output:
14400
result:
ok 1 number(s): "14400"
Test #17:
score: 0
Accepted
time: 1ms
memory: 5588kb
input:
5 4
output:
25200
result:
ok 1 number(s): "25200"
Test #18:
score: 0
Accepted
time: 0ms
memory: 5712kb
input:
5 5
output:
30240
result:
ok 1 number(s): "30240"
Test #19:
score: 0
Accepted
time: 0ms
memory: 5636kb
input:
5 6
output:
25200
result:
ok 1 number(s): "25200"
Test #20:
score: 0
Accepted
time: 0ms
memory: 5672kb
input:
5 7
output:
14400
result:
ok 1 number(s): "14400"
Test #21:
score: 0
Accepted
time: 0ms
memory: 5640kb
input:
5 8
output:
5400
result:
ok 1 number(s): "5400"
Test #22:
score: 0
Accepted
time: 1ms
memory: 5632kb
input:
5 9
output:
1200
result:
ok 1 number(s): "1200"
Test #23:
score: 0
Accepted
time: 0ms
memory: 5720kb
input:
5 10
output:
120
result:
ok 1 number(s): "120"
Test #24:
score: 0
Accepted
time: 1ms
memory: 5732kb
input:
1000 1
output:
533396879
result:
ok 1 number(s): "533396879"
Test #25:
score: 0
Accepted
time: 1ms
memory: 5644kb
input:
1000 100
output:
199484478
result:
ok 1 number(s): "199484478"
Test #26:
score: 0
Accepted
time: 1ms
memory: 7772kb
input:
1000 10000
output:
656650652
result:
ok 1 number(s): "656650652"
Test #27:
score: 0
Accepted
time: 22ms
memory: 19280kb
input:
1000 1000000
output:
0
result:
ok 1 number(s): "0"
Test #28:
score: 0
Accepted
time: 10ms
memory: 14984kb
input:
535164 619302
output:
721871396
result:
ok 1 number(s): "721871396"
Test #29:
score: 0
Accepted
time: 17ms
memory: 19280kb
input:
1000000 1000000
output:
580712335
result:
ok 1 number(s): "580712335"
Test #30:
score: 0
Accepted
time: 15ms
memory: 19348kb
input:
1000000 234534
output:
546630669
result:
ok 1 number(s): "546630669"
Test #31:
score: 0
Accepted
time: 16ms
memory: 19348kb
input:
234523 1000000
output:
127869098
result:
ok 1 number(s): "127869098"
Test #32:
score: 0
Accepted
time: 1ms
memory: 6052kb
input:
44722 10000
output:
0
result:
ok 1 number(s): "0"