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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#388357#8339. Rooted Treeucup-team3282#TL 186ms3588kbC++14594b2024-04-13 14:56:142024-04-13 14:56:14

Judging History

你现在查看的是最新测评结果

  • [2024-04-13 14:56:14]
  • 评测
  • 测评结果:TL
  • 用时:186ms
  • 内存:3588kb
  • [2024-04-13 14:56:14]
  • 提交

answer

#include<iostream>
#include<algorithm>
using namespace std;
long long mod=1e9+9;
long long pow(long long a,long long b=mod-2){
    if(b==0)return 1;
    if(b==1)return a;
    long long ret=pow(a,b>>1);
    if(b&1)return ret*ret%mod*a%mod;
    else return ret*ret%mod;
}
long long E=0;
int main(){
    // cout<<24*pow(3)%mod<<endl;
    long long m,k,Kl=1,El=0;
    cin>>m>>k;
    while(k--){
        // cout<<El*6%mod<<" "<<E*3%mod<<"?"<<Kl<<endl;
        E=(E+(El+1)*m)%mod;
        El=(El*(Kl-1)+m*(El+1))%mod*pow(Kl+m-1)%mod;
        Kl+=m-1;
    }
    cout<<E<<endl;
}

Details

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Test #1:

score: 100
Accepted
time: 0ms
memory: 3588kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3580kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 186ms
memory: 3536kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: -100
Time Limit Exceeded

input:

48 6713156

output:


result: