QOJ.ac
QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#663860 | #8339. Rooted Tree | lllei# | AC ✓ | 225ms | 81816kb | C++14 | 832b | 2024-10-21 17:56:46 | 2024-10-21 17:56:51 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
const int mod=1e9+9;
const int N=1e7+5;
int m,k;
int Pow(int a,long long k)
{
int ans=1;
while(k)
{
if(k&1)ans=1ll*ans*a%mod;
a=1ll*a*a%mod;
k>>=1;
}
return ans;
}
int fct[N],inv[N];
int INV(int x){return inv[x]*1ll*fct[x-1]%mod;}
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cin>>m>>k;
int ans=0,lst=0;
fct[0]=1;
for(int i=1;i<=k;i++)fct[i]=1ll*fct[i-1]*((m-1)*i+1)%mod;
inv[k]=Pow(fct[k],mod-2);
for(int i=k-1;i>=0;i--)inv[i]=1ll*inv[i+1]*((m-1)*(i+1)+1)%mod;
for(int i=1;i<=k;i++)
{
ans+=(lst+1)*1ll*m%mod;
ans%=mod;
lst=(lst*1ll*((m-1)*(i-1))%mod+(lst+1)*1ll*m%mod)%mod;
lst=lst*1ll*INV(i)%mod;
}
cout<<ans<<'\n';
}
Details
Tip: Click on the bar to expand more detailed information
Test #1:
score: 100
Accepted
time: 0ms
memory: 5740kb
input:
6 2
output:
18
result:
ok 1 number(s): "18"
Test #2:
score: 0
Accepted
time: 1ms
memory: 5660kb
input:
2 6
output:
600000038
result:
ok 1 number(s): "600000038"
Test #3:
score: 0
Accepted
time: 16ms
memory: 10412kb
input:
83 613210
output:
424200026
result:
ok 1 number(s): "424200026"
Test #4:
score: 0
Accepted
time: 150ms
memory: 60360kb
input:
48 6713156
output:
198541581
result:
ok 1 number(s): "198541581"
Test #5:
score: 0
Accepted
time: 0ms
memory: 5660kb
input:
1 111
output:
6216
result:
ok 1 number(s): "6216"
Test #6:
score: 0
Accepted
time: 171ms
memory: 63632kb
input:
28 7304152
output:
457266679
result:
ok 1 number(s): "457266679"
Test #7:
score: 0
Accepted
time: 92ms
memory: 36428kb
input:
38 4101162
output:
232117382
result:
ok 1 number(s): "232117382"
Test #8:
score: 0
Accepted
time: 224ms
memory: 81380kb
input:
51 9921154
output:
340670552
result:
ok 1 number(s): "340670552"
Test #9:
score: 0
Accepted
time: 39ms
memory: 20044kb
input:
79 1801157
output:
620550406
result:
ok 1 number(s): "620550406"
Test #10:
score: 0
Accepted
time: 123ms
memory: 47916kb
input:
22 5417157
output:
457449071
result:
ok 1 number(s): "457449071"
Test #11:
score: 0
Accepted
time: 72ms
memory: 32560kb
input:
25 3210162
output:
36368303
result:
ok 1 number(s): "36368303"
Test #12:
score: 0
Accepted
time: 65ms
memory: 27492kb
input:
67 2919160
output:
935195555
result:
ok 1 number(s): "935195555"
Test #13:
score: 0
Accepted
time: 178ms
memory: 72720kb
input:
77 8613163
output:
482832472
result:
ok 1 number(s): "482832472"
Test #14:
score: 0
Accepted
time: 225ms
memory: 81684kb
input:
90 10000000
output:
275581651
result:
ok 1 number(s): "275581651"
Test #15:
score: 0
Accepted
time: 222ms
memory: 81752kb
input:
99 9999999
output:
126087169
result:
ok 1 number(s): "126087169"
Test #16:
score: 0
Accepted
time: 217ms
memory: 81816kb
input:
100 10000000
output:
451590067
result:
ok 1 number(s): "451590067"
Extra Test:
score: 0
Extra Test Passed