Submission #456243

#	Time	Username	Problem	Language	Result	Execution time	Memory
456243		grt	Zapina (COCI20_zapina)	C++17	110 / 110	176 ms	1780 KiB

zapina

#include <bits/stdc++.h>
#define ST first
#define ND second
#define PB push_back

using namespace std;
using ll = long long;
using pi = pair<int,int>;
using vi = vector<int>;

const int nax = 350 + 10, mod = 1e9 + 7;
int n;
int dp[nax][nax][2];
int bi[nax][nax];

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	dp[0][0][0] = 1;
	bi[0][0] = 1;
	for(int i = 0; i <= n; ++i) {
		for(int j = 0; j <= n; ++j) {
			if(i == 0) {
				bi[i][j] = (i == j);
			} else if(j == 0) {
				bi[i][j] = 1;
			} else {
				bi[i][j] = (bi[i - 1][j - 1] + bi[i - 1][j]) % mod;
			}
			//cout << i << " " << j << ": " << bi[i][j] << "\n";
		}
	}
	for(int i = 1; i <= n; ++i) {
		for(int g = 0; g <= n; ++g) {
			for(int j = 0; j <= g; ++j) {
				if(i != j) dp[i][g][0] = (dp[i][g][0] + (ll)bi[g][j] * dp[i - 1][g - j][0]) % mod;
				dp[i][g][1] = (dp[i][g][1] + (ll)bi[g][j] * dp[i - 1][g - j][1]) % mod;
			}
			if(g >= i) {
				dp[i][g][1] = (dp[i][g][1] + (ll)bi[g][i] * dp[i - 1][g - i][0]) % mod;
			}
		}
	}
	cout << dp[n][n][1];
}

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55