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Cod sursa(job #987372)
#include <iostream>
#include <fstream>
#include <vector>
#include <cmath>
using namespace std;
const int N = 252;
const int MOD = 194767;
vector<int> curr(N * N), previous(N * N);
int n, s;
int main()
{
ifstream fin("1-sir.in");
ofstream fout("1-sir.out");
fin >> n >> s;
s = abs(s);
int maxS = n * (n - 1);
maxS /= 2;
if(s > maxS)
{
fout << 0 << '\n';
}
previous[0] = 1;
for(int i = 2; i <= n; ++i)
{
for(int j = 0; j <= maxS; ++j)
{
curr[j] += previous[abs(j - (i - 1))] + previous[j + (i - 1)];
while(curr[j] >= MOD)
{
curr[j] -= MOD;
// fout << curr[j] << ' ';
}
// fout << '\n';
for(int j = 0; j <= maxS; ++j)
{
previous[j] = curr[j];
curr[j] = 0;
}
}
fout << previous[s] << '\n';
return 0;
}