QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#656014 | #8339. Rooted Tree | PleaseHackme# | AC ✓ | 1175ms | 3688kb | C++20 | 968b | 2024-10-19 10:50:15 | 2024-10-19 10:50:16 |
Judging History
answer
#include<bits/stdc++.h>
#define int long long
#define N 1000005
#define M 1000000009
#define endl '\n'
#define PII pair<int,int>
using namespace std;
int ksm(int di,int mi){
int sum=1;
while(mi){
if(mi%2){
sum=sum*di%M;
mi--;
}
else {
di=di*di%M;
mi/=2;
}
}
return sum;
}
PII get(int a,int b,int x,int y){
return {a*y+b*x,b*y};
}
void solve() {
int n,k;cin>>n>>k;
int ans=0;
int e=0,cnt=1;
for(int i=1;i<=k;i++){
int ye=n*(e*ksm(cnt,M-2)%M+1)%M;
//cout<<ksm(cnt,M-2)%M<<endl;
ans=(ans+ye)%M;
ye=((n-1)*(e*ksm(cnt,M-2)%M+1)%M+1)%M;
e=(e+ye)%M;
cnt+=n-1;//叶子结点数更新
}
cout<<ans<<endl;
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
int t=1;//cin>>t;
while(t--) {
solve();
}
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 3688kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 0ms
memory: 3596kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 72ms
memory: 3548kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 790ms
memory: 3544kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 3656kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 857ms
memory: 3620kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 481ms
memory: 3680kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 1165ms
memory: 3616kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 208ms
memory: 3656kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 632ms
memory: 3620kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 377ms
memory: 3628kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 343ms
memory: 3548kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 1012ms
memory: 3604kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 1174ms
memory: 3656kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 1174ms
memory: 3616kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 1175ms
memory: 3560kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed