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Cod sursa(job #280828)
#include<fstream.h>
ifstream f("divk.in");
ofstream g("divk.out");
long long v[500000],nr,n,a,b,k,x,i,j,p;
int main(){
f>>n>>k>>a>>b;v[0]=0;
for(i=1;i<=n&&i<a;i++)
{f>>x;
v[i]=v[i-1]+x;}
for(i;i<=n;i++)
{f>>x;
v[i]=v[i-1]+x;
if(i-b<=0)
p=1;
else p=i-b;
for(j=p;j<=i-a+1;j++)
if((v[i]-v[j-1])%k==0)
nr++;}
g<<nr;
return 0;
}