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Cod sursa(job #517447)
#include<fstream>
typedef long long int lng;
using namespace std;
lng n,k,a,b,v[500000],nr;
void citire(){
lng i;
ifstream in("divk.in");
in>>n>>k>>a>>b;
for(i=0;i<n;i++)in>>v[i];
}
int main(){
ofstream out("divk.out");
citire();
lng i,j,l,s;
for(i=a;i<=b;i++){
for(j=0;j<=(n-i);j++){
s=0;
for(l=0;l<i;l++){
s+=v[j+l];
}
if(s%k==0)nr++;
}
}
out<<nr;
return 0;
}