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Cod sursa(job #652025)
#include <fstream>
using namespace std;
ifstream f("zombie.in");
ofstream g("zombie.out");
long long d,n,k,i,j,a[1000007],ckr,poz;
int main()
{
f>>d>>n>>k;
for(i=1; i<=n; i++)
f>>a[i];
i=1;
while (i<n)
{
poz=i;
if (a[i+k]-a[poz]>d) i++,ckr++;
else
{
while(a[i+k]-a[poz]<=d&&i<=n) i++;
ckr+=k;
}
}
g<<ckr;
f.close();
g.close();
return 0;
}