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Cod sursa(job #829750)
#include<fstream>
#include<cstdlib>
#define MOD 194767
using namespace std;
ifstream f("1-sir.in");
ofstream g("1-sir.out");
int n,i,p,s,j,smax,a[2][40000];
/*int abs(int x)
{
if(x>0)
return x;
return -x;
}*/
int main()
{
f>>n>>s;
f.close();
int sol;
smax=n*(n-1);
if(smax<abs(s))
{
sol=0;
}
else
{
a[0][0]=1;
p=1;
for(i=2;i<=n;p=p^1,++i)
for(j=0;j<=smax;++j)
{
a[p][j]=a[p^1][j+i-1]+a[p^1][abs(j-(i-1))];
if(a[p][j]>=MOD)
a[p][j]-=MOD;
}
if(n%2)
sol=a[0][s];
else
sol=a[1][s];
}
g<<sol<<'\n';
return 0;
}