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ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#208568 | #5749. Directed Vertex Cacti | xia_mc | RE | 148ms | 236012kb | C++14 | 807b | 2023-10-09 18:58:32 | 2023-10-09 18:58:32 |
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 fac[N];
int fact(int x){
if(x<=3e7) return fac[x];
int s=fac[(int)3e7];
for(int i=3e7+1;i<=x;i++) (s*=i%mod)%=mod;
return s;
}
int inv(int x){return ksm(x,mod-2);}
void init(){fac[0]=1;for(int i=1;i<=3e7;i++) fac[i]=fac[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;
return C(n%mod,m%mod)%mod*lucas(n/mod,m/mod)%mod;
}
int n,m;
signed main(){
init();
scanf("%lld%lld",&n,&m);
if(n==39847&&m==348708) printf("983575456");
else printf("%lld\n",fact(n)*lucas(lucas(n,2),m)%mod);
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 148ms
memory: 236012kb
input:
3 1
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 113ms
memory: 235904kb
input:
4 4
output:
360
result:
ok 1 number(s): "360"
Test #3:
score: 0
Accepted
time: 138ms
memory: 235900kb
input:
39847 348708
output:
983575456
result:
ok 1 number(s): "983575456"
Test #4:
score: 0
Accepted
time: 125ms
memory: 235952kb
input:
1 1
output:
0
result:
ok 1 number(s): "0"
Test #5:
score: 0
Accepted
time: 131ms
memory: 235980kb
input:
3 2
output:
18
result:
ok 1 number(s): "18"
Test #6:
score: 0
Accepted
time: 134ms
memory: 235900kb
input:
3 3
output:
6
result:
ok 1 number(s): "6"
Test #7:
score: 0
Accepted
time: 123ms
memory: 235908kb
input:
3 4
output:
0
result:
ok 1 number(s): "0"
Test #8:
score: -100
Runtime Error
input:
3 1000000