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QOJ
| ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
|---|---|---|---|---|---|---|---|---|---|
| #462596 | #8339. Rooted Tree | zttttt | TL | 1450ms | 115512kb | C++14 | 1.7kb | 2024-07-03 21:52:00 | 2024-07-03 21:52:00 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#define int long long
const int N=5e7+10,M=1e9+9;
int ny[N],dp[N],zt[N],maxx,f[N];
int ksm(int a,int b,int c){
int b1=b;
zt[1]=a%c;
int cnt=1;
int ans=1;
while(b1){
cnt++;
zt[cnt]=zt[cnt-1]*zt[cnt-1]%c;
b1>>=1;
}
cnt=0;
while(b){
cnt++;
if(b&1){
//cnt++;
ans*=zt[cnt];
ans%=c;
}
b>>=1;
}
return ans;
}
signed main(){
int m,k;
cin>>m>>k;
f[0]=1;
for(int i=1;i<=k;i++){
f[i]=f[i-1]-1+m;
}
//for(int i=1;i<=k;i++)cout<<f[i]<<endl;
// if(f[k]>10000000)maxx=10000000;
// else maxx=f[k];
dp[0]=0;
ny[1]=1;
// for(int i=m;i<=f[k];i+=m-1){
// cout<<i<<" "<<M%i<<" "<<ny[M%i]<<endl;
// ny[i]=(M-M/i)*ny[M%i]%M;
// }
for(int i=1;i<=k;i++){
// if(f[i]<=1e7){
//cout<<M%f[i]<<endl;
//if(f[i]<=50000000){
// if(M%f[i]<=50000000&&ny[M%f[i]]){
// ny[f[i]]=(M-M/f[i])*ny[M%f[i]]%M;
// }else{
// ny[f[i]]=ksm(f[i],M-2,M);
// }
// dp[i]=((dp[i-1]*f[i-1])%M*ny[f[i]]%M-(dp[i-1]*ny[f[i]]%M)+M)%M+m*dp[i-1]%M*ny[f[i]]%M+m*ny[f[i]]%M;
// dp[i]%=M;
//}else{
// int zqx;
// if(M%f[i]<=50000000&&ny[M%f[i]]){
// zqx=(M-M/f[i])*ny[M%f[i]]%M;
// }else{
// zqx=ksm(f[i],M-2,M);
// }
int zqx=ksm(f[i],M-2,M);
dp[i]=((dp[i-1]*f[i-1])%M*zqx%M-(dp[i-1]*zqx%M)+M)%M+m*dp[i-1]%M*zqx%M+m*zqx%M;
dp[i]%=M;
//}
//cout<<i<<" "<<dp[i]<<endl;
// }else{
// int zqx=ksm(f[i],M-2,M);
// dp[i]=((dp[i-1]*f[i-1])%M*zqx%M-(dp[i-1]*zqx%M)+M)%M+m*dp[i-1]%M*zqx%M+m*zqx%M;
// dp[i]%=M;
// }
}
//for(int i=1;i<=k;i++)cout<<dp[i]<<endl;
int ans1=dp[k]*f[k]%M;
for(int i=1;i<k;i++){
ans1=ans1+dp[i]%M;
ans1%=M;
}
cout<<ans1<<endl;
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 1ms
memory: 9672kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 9672kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 131ms
memory: 21204kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 1450ms
memory: 115512kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 1ms
memory: 9744kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: -100
Time Limit Exceeded
input:
28 7304152
output:
457266679