QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#379066#8339. Rooted TreeBUET_POTATOES#AC ✓1087ms159888kbC++20904b2024-04-06 16:05:112024-04-06 16:05:12

Judging History

你现在查看的是最新测评结果

  • [2024-04-06 16:05:12]
  • 评测
  • 测评结果:AC
  • 用时:1087ms
  • 内存:159888kb
  • [2024-04-06 16:05:11]
  • 提交

answer

#include<bits/stdc++.h>
using namespace std;

using ll = long long int;

const ll mod = 1e9+9;
const int nmax = 1e7+10;

ll leafcount[nmax];
ll e_leaf[nmax];

ll modexpo(ll x, ll n){
    ll ret = 1;
    while(n){
        if(n&1) ret = ret * x % mod;
        x = x * x % mod;
        n /= 2;
    }
    return ret;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

//    cout<<84 * modexpo(5, mod-2) % mod <<endl;

    ll m, k;
    cin>>m>>k;

    leafcount[0] = 1;
    e_leaf[0] = 0;

    ll ans = 0;

    for(int i = 1; i<=k; i++){
        leafcount[i] = leafcount[i-1] + (m-1);

        ans += (e_leaf[i-1] + 1) * m;
        ans %= mod;

        e_leaf[i] = (e_leaf[i-1] * (leafcount[i-1] - 1) + (e_leaf[i-1] + 1) * m) % mod
        ;
        e_leaf[i] = e_leaf[i] * modexpo(leafcount[i], mod-2) % mod;
    }

    cout<<ans<<endl;

}


Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 1ms
memory: 5596kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 1ms
memory: 5624kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 69ms
memory: 15412kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 724ms
memory: 109732kb

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: 789ms
memory: 120744kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 443ms
memory: 72136kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1075ms
memory: 159712kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 193ms
memory: 35320kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 580ms
memory: 89744kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 352ms
memory: 56788kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 324ms
memory: 52808kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 927ms
memory: 138828kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1076ms
memory: 159888kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1083ms
memory: 159792kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1087ms
memory: 159880kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed