#include <bits/stdc++.h>
using namespace std;
int v[200005];
int main()
{
int n, a, b;
cin>>n>>a>>b;
for(int i=0; i<n; i++)
cin>>v[i];
if(a == b)
{
sort(v, v+n);
int maxx = 0;
for(int i=0; i<n; i++)
{
int eli = v[i], elf = v[i + a - 1];
maxx = max(maxx, elf - eli);
i += a;
i--;
}
cout<<maxx;
}
return 0;
}
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