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Cod sursa(job #723765)
#include <fstream>
using namespace std;
int i,j,h,n,k,a,b,t=0;
long v[500000];
long long s;
int main()
{
ifstream inf("divk.in");
inf >> n >> k >> a >> b;
for (i=0; i<n; i++)
inf >> v[i];
inf.close();
for (i=0; i<=n-a; i++)
for (j=a; j<=b && i+j<=n; j++)
{
s=0;
for (h=i; h<i+j; h++)
s+=v[h];
if (s%k==0)
t++;
}
ofstream outf("divk.out");
outf << t << '\n';
outf.close();
return 0;
}