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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#663860#8339. Rooted Treelllei#AC ✓225ms81816kbC++14832b2024-10-21 17:56:462024-10-21 17:56:51

Judging History

你现在查看的是最新测评结果

  • [2024-10-21 17:56:51]
  • 评测
  • 测评结果:AC
  • 用时:225ms
  • 内存:81816kb
  • [2024-10-21 17:56:46]
  • 提交

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