Submission #19815

#	Time	Username	Problem	Language	Result	Execution time	Memory
19815		yukariko	괄호 (kriii4_R)	C++14	0 / 100	8 ms	4088 KiB

R

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const ll MOD = 1000000007;

ll N, K;

int main() {
	scanf("%lld%lld", &N, &K);
	vector<ll> cache(N + 1);
	cache[0] = cache[1] = 1;
	for (ll i = 2; i <= N; i++)
		cache[i] = ((cache[i - 1] * 2 + cache[i - 2] * 4 * (i - 1)) % MOD / (i + 1) % MOD) % MOD;
	printf("%lld", cache[N]);
	return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 92