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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#507437#8339. Rooted Treeucup-team2307#AC ✓1201ms3716kbC++201.0kb2024-08-06 17:40:572024-08-06 17:40:57

Judging History

你现在查看的是最新测评结果

  • [2024-08-06 17:40:57]
  • 评测
  • 测评结果:AC
  • 用时:1201ms
  • 内存:3716kb
  • [2024-08-06 17:40:57]
  • 提交

answer

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;

typedef long long ll;
#define int ll

#define fi first
#define se second
#define pb push_back

typedef long double ld;
#define double  ld

const int mod = 1e9+9;

int bpow(int a, int b)
{
    int r = 1;
    while (b > 0)
    {
        if (b&1)
            r = r*a%mod;
        a = a*a%mod;
        b/=2;
    }
    return r;
}
int inv(int a)
{
    return bpow(a, mod-2);
}

signed main()
{
	cin.tie(0)->sync_with_stdio(0);
	cin.exceptions(cin.failbit);

    int M, K;
//    M = 6;
//    K = 2;

    cin>>M>>K;
    int iM = inv(M);
    int n = 1;
    int s = 0;
    for (int i=0; i<K; i++)
    {
        int up = (s*(1-iM)+n)%mod*M%mod;
        int down = ((n-1)*(M-1)%mod*iM+1)%mod;
//        cout<<up<<"/"<<down<<"\n";

        int ds = up*inv(down)%mod;
        s = (s+ds)%mod;
        s = (s+mod)%mod;
        n = (n+M)%mod;

//        cout<<n<<" "<<s<<"\n";
    }
    cout<<s<<"\n";
}


Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3588kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3668kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 74ms
memory: 3676kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 805ms
memory: 3656kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3716kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 875ms
memory: 3592kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 492ms
memory: 3708kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1189ms
memory: 3652kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 212ms
memory: 3592kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 651ms
memory: 3712kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 385ms
memory: 3592kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 350ms
memory: 3588kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1032ms
memory: 3648kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1201ms
memory: 3652kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1198ms
memory: 3712kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1198ms
memory: 3648kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed