답안 #19767

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
19767 2016-02-25T05:24:27 Z Qwaz 괄호 (kriii4_R) C++14
100 / 100
137 ms 1084 KB
#include <cstdio>

typedef long long ll;
const int MOD = 1000000007;

ll modpow(ll a, ll x) {
	ll ret = 1;
	a = a % MOD;

	while (x) {
		if (x & 1) ret = ret * a % MOD;
		a = a * a % MOD;
		x >>= 1;
	}

	return ret;
}

int main() {
	int n, k;
	scanf("%d%d", &n, &k);

	ll res = 1, catalan = 1, xk = 1;
	for (int i = 2; i <= n+1; i++) {
		if (i & 1) {
			res = res * (k+1) % MOD;
		} else {
			res = (res * (k+1) - catalan * xk) % MOD;
			if (res < 0) res += MOD;

			int t = (i >> 1) - 1;
			catalan = 2 * (2*t + 1) * modpow(t+2, MOD-2) % MOD * catalan % MOD;
			xk = xk * k % MOD;
		}
	}

	printf("%lld\n", res);

	return 0;
}
# 결과 실행 시간 메모리 Grader output
1 Correct 42 ms 1084 KB Output is correct
2 Correct 8 ms 1084 KB Output is correct
3 Correct 101 ms 1084 KB Output is correct
4 Correct 112 ms 1084 KB Output is correct
5 Correct 114 ms 1084 KB Output is correct
6 Correct 63 ms 1084 KB Output is correct
7 Correct 71 ms 1084 KB Output is correct
8 Correct 48 ms 1084 KB Output is correct
9 Correct 20 ms 1084 KB Output is correct
10 Correct 5 ms 1084 KB Output is correct
11 Correct 5 ms 1084 KB Output is correct
12 Correct 103 ms 1084 KB Output is correct
13 Correct 97 ms 1084 KB Output is correct
14 Correct 42 ms 1084 KB Output is correct
15 Correct 46 ms 1084 KB Output is correct
16 Correct 41 ms 1084 KB Output is correct
17 Correct 125 ms 1084 KB Output is correct
18 Correct 129 ms 1084 KB Output is correct
19 Correct 137 ms 1084 KB Output is correct
20 Correct 137 ms 1084 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 1084 KB Output is correct
2 Correct 12 ms 1084 KB Output is correct
3 Correct 25 ms 1084 KB Output is correct
4 Correct 120 ms 1084 KB Output is correct
5 Correct 77 ms 1084 KB Output is correct
6 Correct 95 ms 1084 KB Output is correct
7 Correct 66 ms 1084 KB Output is correct
8 Correct 38 ms 1084 KB Output is correct
9 Correct 65 ms 1084 KB Output is correct
10 Correct 9 ms 1084 KB Output is correct
11 Correct 107 ms 1084 KB Output is correct
12 Correct 112 ms 1084 KB Output is correct
13 Correct 103 ms 1084 KB Output is correct
14 Correct 50 ms 1084 KB Output is correct
15 Correct 62 ms 1084 KB Output is correct
16 Correct 63 ms 1084 KB Output is correct
17 Correct 7 ms 1084 KB Output is correct
18 Correct 136 ms 1084 KB Output is correct
19 Correct 137 ms 1084 KB Output is correct
20 Correct 136 ms 1084 KB Output is correct