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IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#546954#8339. Rooted Treeucup-team1769AC ✓1421ms81132kbC++20953b2024-09-04 16:11:072024-09-04 16:11:08

Judging History

你现在查看的是最新测评结果

  • [2024-09-04 16:11:08]
  • 评测
  • 测评结果:AC
  • 用时:1421ms
  • 内存:81132kb
  • [2024-09-04 16:11:07]
  • 提交

answer

#include <bits/stdc++.h>

using u32 = unsigned;
using i64 = long long;
using u64 = unsigned long long;

constexpr int P = 1000000009;

int power(int a, int b) {
	int res = 1;
	for (; b; b /= 2, a = 1LL * a * a % P) {
		if (b % 2) {
			res = 1ll * res * a % P;
		}
	}
	return res;
}

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

	int m, k;
	std::cin >> m >> k;

	std::vector<int> p(k, 0);
	for (int i = 0; i < k; i++) {
		p[i] = power((m - 1) * i + 1, P - 2);
	}

	auto inv = [&](int a, int b) -> int {
		return 1ll * a * p[b] % P;
	};

	std::vector<int> a(k, 0);
	for (int i = 1; i < k; i++) {
		int res = 1ll * inv((m - 1) * i + 1, i - 1) * a[i - 1] % P;
		a[i] = (res + m) % P;
	}
	for (int i = 0; i < k; i++) {
		a[i] = (inv(a[i], i) + 1) % P;
	}
	
	int ans = std::accumulate(a.begin(), a.end(), 0ll) % P;
	ans = 1ll * ans * m % P;

	std::cout << ans << "\n";

	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3556kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

score: 0
Accepted
time: 0ms
memory: 3620kb

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 88ms
memory: 8128kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 949ms
memory: 55584kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

score: 0
Accepted
time: 0ms
memory: 3616kb

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 1032ms
memory: 60244kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 573ms
memory: 35256kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 1388ms
memory: 80528kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 258ms
memory: 17388kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 759ms
memory: 45296kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 454ms
memory: 28224kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 416ms
memory: 25936kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 1214ms
memory: 70508kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 1411ms
memory: 81132kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 1412ms
memory: 81104kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 1421ms
memory: 81128kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed