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Cod sursa(job #587725)
#include<fstream.h>
#include<iostream.h>
int main()
{int n,k,a,b,s[10],v[10],i,q,j;
ifstream f("divk.in");
ofstream g("divk.out");
f>>n>>k>>a>>b;
for(i=1;i<=n;i++)
f>>v[i];
i=2;
s[1]=v[1];
do
{s[i]=v[i]+s[i-1];
i++;}
while(i!=n+1);
for(i=1;i<=n-1;i++)
{for(j=i+a;j<=i+b;j++)
if((s[j]-s[i]%k==0)&&(j<=n))
q++; }
g<<q<<endl;
f.close();
g.close();
return 0;
}