Cod sursa(job #2592048)

Utilizator mirceamaierean41Mircea Maierean mirceamaierean41 Data 31 martie 2020 23:46:56
Problema 1-sir Scor 90
Compilator cpp-64 Status done
Runda Arhiva de probleme Marime 0.61 kb
#include <fstream>
#include <cmath>
using namespace std;

ifstream fin("1-sir.in");
ofstream fout("1-sir.out");

const int NMAX = 100005;
const int MOD = 194767;

int dp[2][NMAX], n, s, ind;

int main()
{
	fin >> n >> s;
	s = abs(s);
	int k = ((n * (n - 1)) >> 1);
	if (s > k)
	{
		fout << "0\n";
		return 0;
	}

	dp[0][0] = 1;
	int p = 1;
	for (int i = 2; i <= n; ++i)
	{
		for (int j = 0; j < k; ++j)
		{
			dp[p][j] = dp[1 - p][j + i - 1] + dp[1 - p][abs(j - i + 1)];
			if (dp[p][j] >= MOD)
				dp[p][j] -= MOD;
		}
		p ^= 1;
	}
	p ^= 1;
	fout << dp[p][s] << "\n";
	return 0;
}