Submission #850934

#	Time	Username	Problem	Language	Result	Execution time	Memory
850934		Itamar	NoM (RMI21_nom)	C++14	0 / 100	11 ms	33372 KiB

Main

#include <iostream>
using namespace std;
#include <vector>
#define ll long long
#define pll pair<ll,ll>
#define vll vector<ll>

const int siz = 2001;
ll dp[siz][siz];
ll fac[siz];
ll c[siz][siz];
const int mod = 1e9 + 7;
int main()
{
    int n, m;
    cin >> n >> m;
    dp[0][0] = 1;
    fac[0] = 1;
    for (int i = 1; i < siz; i++) {
        fac[i] = (i * fac[i - 1]) % mod;
    }
    for (int i = 0; i < siz; i++) {
        for (int j = 0; j < siz; j++) {
            if (j == 0)c[i][j] = 1;
            else if (i == 0)c[i][j] = 0;
            else c[i][j] = (c[i - 1][j] + c[i - 1][j - 1]) % mod;
        }
    }
    for (int i = 1; i <= m; i++) {
        int pile = ((2 * n) / m) + (i <= (2 * n) % m);
        for (int j = 0; j <= 2 * n; j++) {
            for (int k = 0; k<=j && j+pile>=2*k&& k<=pile; k++) {
                dp[i][j] += (((dp[i - 1][j +pile-2*k] * (c[j+pile-2*k][j-k]*fac[pile-k])%mod) % mod) * c[j][k]) % mod;
            }
        }
    }
    for (int i = 0; i < n; i++) {
        dp[m][0]=(2*dp[m][0])%mod;
    }
    cout << dp[m][0];
}

// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu

// Tips for Getting Started: 
//   1. Use the Solution Explorer window to add/manage files
//   2. Use the Team Explorer window to connect to source control
//   3. Use the Output window to see build output and other messages
//   4. Use the Error List window to view errors
//   5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
//   6. In the future, to open this project again, go to File > Open > Project and select the .sln file

• Subtask 1: 0 / 9
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 18
• Subtask 5: 0 / 48