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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#462623 | #8339. Rooted Tree | castc | TL | 146ms | 8308kb | C++20 | 846b | 2024-07-03 22:18:31 | 2024-07-03 22:18:32 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
using ll = long long;
// #define int long long
const int N=5e7+10,M=1e9+9;
int dp[N],maxx,f[N];
ll qpow(ll a, ll n, ll p = M) {
ll ans = 1;
while(n) {
if(n & 1) {
ans = ans % p * a % p;
}
a = a % p * a % p;
n >>= 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;
}
dp[0]=0;
for(int i=1;i<=k;i++){
int zqx=qpow(f[i],M-2);
dp[i]=(1ll*dp[i-1]*f[i-1]%M*zqx%M-1ll*dp[i-1]*zqx%M+1ll*m*dp[i-1]%M*zqx%M+1ll*m*zqx%M) % M;
dp[i] += M;
dp[i] %= M;
}
int ans1=1ll*dp[k]*f[k]%M;
for(int i=1;i<k;i++){
ans1+=dp[i];
ans1%=M;
}
cout<<ans1<<endl;
return 0;
}
Details
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Test #1:
score: 100
Accepted
time: 0ms
memory: 3556kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3660kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 146ms
memory: 8308kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: -100
Time Limit Exceeded
input:
48 6713156
output:
198541581