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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 |
---|---|---|---|---|---|---|---|---|---|
#690213 | #8339. Rooted Tree | ryx | TL | 1440ms | 3684kb | C++23 | 590b | 2024-10-30 21:03:22 | 2024-10-30 21:03:22 |
Judging History
answer
#include <bits/stdc++.h>
#define int long long
#define endl '\n'
using namespace std;
const int mod = 1e9 + 9;
int quickpow(int x,int y){
int res = 1;
while(y){
if(y&1) res = res * x % mod;
x = x * x %mod;
y>>=1;
}
return res;
}
signed main(){
int m,k;
cin>>m>>k;
int ans = 0;
int n = 1,all = 0;
for(int i=1;i<=k;i++){
int e = all*quickpow(n,mod-2)%mod;
ans = (ans + m*(e+1)%mod)%mod;
int p = quickpow(n,mod-2);
int temp = (n*all%mod+(m-1)*all%mod+n*m%mod) %mod;
all = p * temp % mod;
n=n-1+m;
}
cout<<ans<<endl;
return 0;
}
详细
Test #1:
score: 100
Accepted
time: 0ms
memory: 3620kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3532kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 132ms
memory: 3684kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 1440ms
memory: 3592kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3680kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: -100
Time Limit Exceeded
input:
28 7304152
output:
457266679