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Cod sursa(job #31024)
#include<fstream.h>
long v[100000],n,div,min,max;
unsigned long nr_tot;
ifstream f("divk.in");
ofstream g("divk.out");
void citire()
{
f>>n>>div>>min>>max;
long i;
for(i=1;i<=n;i++)
f>>v[i];
}
void rez()
{
long i,j,nr,s;
int ok;
for(i=1;i<=n-min+1;i++)
{
s=0;
for(j=1;j<=min;j++)
s=s+v[i+j-1];
if(s%div==0)
nr_tot++;
for(j=min+1;j<=max&&i+j-1<=n;j++)
{
s=s+v[i+j-1];
if(s%div==0)
nr_tot++;
}
}
}
int main()
{
citire();
rez();
g<<nr_tot;
f.close();
g.close();
return 0;
}