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QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#348210#8339. Rooted Treeucup-team206#AC ✓198ms159912kbC++171015b2024-03-09 17:26:482024-03-09 17:26:50

Judging History

你现在查看的是最新测评结果

  • [2024-03-09 17:26:50]
  • 评测
  • 测评结果:AC
  • 用时:198ms
  • 内存:159912kb
  • [2024-03-09 17:26:48]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
const int N = 1e7 + 10;
const int p = 1e9 + 9;
int m, k;
int h[N], hinv[N], hfac[N], g[N], f[N];
inline int Qpow(int x, int y = p - 2) {
    int ans = 1;
    for (; y; y >>= 1, x = 1ll * x * x % p) 
        if (y & 1) ans = 1ll * ans * x % p;
    return ans;
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> m >> k;
    h[0] = 1; hfac[0] = 1; 
    for (int i = 1; i <= k; ++i) {
        h[i] = (h[i - 1] + m - 1) % p;
        hfac[i] = 1ll * hfac[i - 1] * h[i] % p;
    }
    hinv[0] = 1;
    for (int i = k, val = Qpow(hfac[k]); i; --i) {
        hinv[i] = 1ll * hfac[i - 1] * val % p;
        val = 1ll * val * h[i] % p;
    }
    int ans = 0;
    for (int i = 1; i <= k; ++i) {
        int val = 1ll * g[i - 1] * hinv[i - 1] % p;
        ans = (ans + 1ll * (val + 1) * m) % p;
        g[i] = (g[i - 1] - val + 1ll * (val + 1) * m) % p;
    }
    if (ans < 0) ans += p;
    cout << ans << endl;
    return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 7744kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

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

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 16ms
memory: 13208kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 121ms
memory: 108564kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 1ms
memory: 3668kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 148ms
memory: 117760kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 80ms
memory: 67756kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 197ms
memory: 158712kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 35ms
memory: 31732kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 107ms
memory: 90096kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 54ms
memory: 54316kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 58ms
memory: 50064kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 183ms
memory: 139464kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 198ms
memory: 159792kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 190ms
memory: 159912kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 186ms
memory: 159888kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed