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Cod sursa(job #459419)
#include<iostream>
#include<fstream>
#define max_N 2
#define max_S 32640
using namespace std;
ifstream fin("1-sir.in");
ofstream fout("1-sir.out");
int N, S, D[max_N][max_S], i, j, k;
int main()
{
fin >> N >> S;
D[0][0] = 1;
for(i = 1; i <= N - 1; i ++)
{
for(j = 0; j <= N*N; j ++)
D[1][j] = D[0][j + (i - 1)] + D[0][j - (i - 1)];
for(k = 0; k <= N*N ; k ++)
{
D[0][k] = D[1][k];
D[1][k] = 0;
}
}
fout << D[0][S];
return 0;
}