QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#347613#8339. Rooted Treeucup-team1303#AC ✓54ms3712kbC++201.9kb2024-03-09 14:31:452024-03-09 14:31:47

Judging History

你现在查看的是最新测评结果

  • [2024-03-09 14:31:47]
  • 评测
  • 测评结果:AC
  • 用时:54ms
  • 内存:3712kb
  • [2024-03-09 14:31:45]
  • 提交

answer

// MagicDark
#include <bits/stdc++.h>
#define int long long
#define debug cerr << "[" << __LINE__ << "] "
#define SZ(x) (int) x.size() - 1
#define all(x) x.begin(), x.end()
#define ms(x, y) memset(x, y, sizeof x)
#define F(i, x, y) for (int i = (x); i <= (y); i++)
#define DF(i, x, y) for (int i = (x); i >= (y); i--)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
template <typename T> inline void chkmax(T& x, T y) {x = max(x, y);}
template <typename T> inline void chkmin(T& x, T y) {x = min(x, y);}
template <typename T> inline void read(T &x) {
	x = 0; int f = 1; char c = getchar();
	for (; !isdigit(c); c = getchar()) if (c == '-') f = -f;
	for (; isdigit(c); c = getchar()) x = (x << 1) + (x << 3) + (c ^ 48);
	x *= f;
}
const int N = 1e7 + 10, MOD = 1e9 + 9;
// int fac[N], ifac[N], inv[N];
// inline void binom(int x) {
// 	fac[0] = ifac[0] = inv[1] = 1;
// 	F(i, 2, x) inv[i] = (ll) (MOD - MOD / i) * inv[MOD % i] % MOD;
// 	F(i, 1, x) fac[i] = (ll) fac[i - 1] * i % MOD, ifac[i] = (ll) ifac[i - 1] * inv[i] % MOD;
// }
// inline int C(int x, int y) {return x < y || y < 0 ? 0 : (ll) fac[x] * ifac[y] % MOD * ifac[x - y] % MOD;}
inline int power(int x, int y = MOD - 2) {
	int ans = 1;
	for (; y; x = (ll) x * x % MOD, y >>= 1)
		if (y & 1) ans = (ll) ans * x % MOD;
	return ans;
}
inline void add(int &x, ll y) {x = (x + y) % MOD;}
signed main() {
	int m, k; read(m), read(k);
	// binom(1e7 + 5);
	int ans = 0, g = 0, t = 1, s = 1;
	F(i, 1, k) {
		g = ((ll) g * s + ans) % MOD;
		t = (ll) t * s % MOD;
		ans = ((ll) ans * (s - 1 + MOD) + (ll) ans * m + (ll) t * m) % MOD;
		s = ((ll) s + m - 1 + MOD) % MOD;
		// ans = (ll) ans * (i + (i == 1)) % MOD;
	}
	add(g, ans);
	// add(g, MOD - t);
	// debug << ans << ' ' << g << ' ' << t << endl;
	// debug << ans << endl;
	cout << (ll) g * power(t) % MOD;
	return 0;
}
/* why?
*/

Details

Tip: Click on the bar to expand more detailed information

Test #1:

score: 100
Accepted
time: 0ms
memory: 3652kb

input:

6 2

output:

18

result:

ok 1 number(s): "18"

Test #2:

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

input:

2 6

output:

600000038

result:

ok 1 number(s): "600000038"

Test #3:

score: 0
Accepted
time: 4ms
memory: 3592kb

input:

83 613210

output:

424200026

result:

ok 1 number(s): "424200026"

Test #4:

score: 0
Accepted
time: 36ms
memory: 3652kb

input:

48 6713156

output:

198541581

result:

ok 1 number(s): "198541581"

Test #5:

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

input:

1 111

output:

6216

result:

ok 1 number(s): "6216"

Test #6:

score: 0
Accepted
time: 39ms
memory: 3656kb

input:

28 7304152

output:

457266679

result:

ok 1 number(s): "457266679"

Test #7:

score: 0
Accepted
time: 23ms
memory: 3604kb

input:

38 4101162

output:

232117382

result:

ok 1 number(s): "232117382"

Test #8:

score: 0
Accepted
time: 53ms
memory: 3528kb

input:

51 9921154

output:

340670552

result:

ok 1 number(s): "340670552"

Test #9:

score: 0
Accepted
time: 10ms
memory: 3712kb

input:

79 1801157

output:

620550406

result:

ok 1 number(s): "620550406"

Test #10:

score: 0
Accepted
time: 29ms
memory: 3528kb

input:

22 5417157

output:

457449071

result:

ok 1 number(s): "457449071"

Test #11:

score: 0
Accepted
time: 18ms
memory: 3668kb

input:

25 3210162

output:

36368303

result:

ok 1 number(s): "36368303"

Test #12:

score: 0
Accepted
time: 16ms
memory: 3704kb

input:

67 2919160

output:

935195555

result:

ok 1 number(s): "935195555"

Test #13:

score: 0
Accepted
time: 46ms
memory: 3708kb

input:

77 8613163

output:

482832472

result:

ok 1 number(s): "482832472"

Test #14:

score: 0
Accepted
time: 54ms
memory: 3656kb

input:

90 10000000

output:

275581651

result:

ok 1 number(s): "275581651"

Test #15:

score: 0
Accepted
time: 50ms
memory: 3652kb

input:

99 9999999

output:

126087169

result:

ok 1 number(s): "126087169"

Test #16:

score: 0
Accepted
time: 54ms
memory: 3520kb

input:

100 10000000

output:

451590067

result:

ok 1 number(s): "451590067"

Extra Test:

score: 0
Extra Test Passed