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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#627556#8339. Rooted TreeFeiAC ✓1211ms3704kbC++17833b2024-10-10 16:18:282024-10-10 16:18:28

Judging History

你现在查看的是最新测评结果

  • [2024-10-10 16:18:28]
  • 评测
  • 测评结果:AC
  • 用时:1211ms
  • 内存:3704kb
  • [2024-10-10 16:18:28]
  • 提交

answer

#include<bits/stdc++.h>

using i64 = long long;

const int mod = 1000000009;

i64 ksm (i64 a, i64 b) {
    i64 res = 1;
    while(b) {
        if (b & 1) {
            res = res * a % mod;
        }
        a = a * a % mod;
        b >>= 1;
    }
    return res;
}
void solve() {
    i64 m, k;
    std::cin >> m >> k;
    i64 a = 1, n = m;
    i64 ans = m;
    for(int i = 1; i < k; i++) {
        ans = (ans + (a + 1) * m % mod) % mod;
        a = ((n - 1+mod)%mod * a % mod + (a + 1)%mod * m%mod)%mod;
        n = (n - 1 + m) % mod;
        a = a * ksm(n, mod - 2) % mod;
    }
    std::cout << ans << '\n';
}  

signed main() {
    std::ios::sync_with_stdio(0);
    std::cout.tie(0);   
    std::cin.tie(0);

    i64 t = 1; 
    // std::cin >> t;
    while (t--) {
        solve();
    }
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3704kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3584kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 75ms
memory: 3576kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 813ms
memory: 3580kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3572kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 887ms
memory: 3624kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 497ms
memory: 3640kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1199ms
memory: 3584kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 215ms
memory: 3584kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 659ms
memory: 3700kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 386ms
memory: 3648kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 354ms
memory: 3660kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1044ms
memory: 3640kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1211ms
memory: 3648kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1211ms
memory: 3580kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1210ms
memory: 3576kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed