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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#207903 | #5749. Directed Vertex Cacti | xia_mc | WA | 0ms | 1596kb | C++14 | 723b | 2023-10-08 22:16:46 | 2023-10-08 22:16:46 |
Judging History
answer
#include<stdio.h>
#define int long long
const int N=3e7+5,mod=1e9+9;
int ksm(int x,int y){
int s=1;
while(y){
if(y&1) (s*=x%mod)%=mod;
(x*=x%mod)%=mod;y>>=1;
}
return s;
}
// int fact[N];
int fact(int x){int s=1;for(int i=2;i<=x;i++) s*=i;return s;}
int inv(int x){return ksm(x,mod-2);}
// void init(){fact[0]=1;for(int i=1;i<=mod;i++) fact[i]=fact[i-1]*i%mod;}
int C(int n,int m){
return fact(n)*inv(fact(n-m))%mod*(inv(fact(m)))%mod;
}
int lucas(int n,int m){
if(m==0) return 1;
if(n==0) return 1;
return C(n%mod,m%mod)%mod*lucas(n/mod,m/mod)%mod;
}
int n,m;
signed main(){
// init();
scanf("%lld%lld",&n,&m);
printf("%lld\n",fact(n)*lucas(lucas(n,2),m)%mod);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 1512kb
input:
3 1
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 1576kb
input:
4 4
output:
360
result:
ok 1 number(s): "360"
Test #3:
score: -100
Wrong Answer
time: 0ms
memory: 1596kb
input:
39847 348708
output:
0
result:
wrong answer 1st numbers differ - expected: '983575456', found: '0'