This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
using namespace std;
ll n,q,k;
struct segtree{
int n;
vector<ll>d;
segtree(ll n){
d.resize(4*n);
build(1,1,n);
}
void build(ll v,ll l,ll r){
if(l==r){
d[v]=0;
return;
}
ll m=(l+r)/2;
build(v*2,l,m);
build(v*2+1,m+1,r);
d[v]=d[v*2]+d[v*2+1];
}
ll query(ll v,ll l,ll r,ll L,ll R){
if(L>R||l>R||L>r) return 0;
if(L<=l&&r<=R){
return d[v];
}
ll m=(l+r)/2;
return query(v*2,l,m,L,R)+query(v*2+1,m+1,r,L,R);
}
void update(ll v,ll l,ll r,ll pos,ll val){
if(pos<l||r<pos) return;
if(l==r){
d[v]=val;
return;
}
ll m=(l+r)/2;
update(v*2,l,m,pos,val);
update(v*2+1,m+1,r,pos,val);
d[v]=d[v*2]+d[v*2+1];
}
void updater(ll node, ll L, ll R, ll l, ll r, ll val){
if (L > R || L > r || R < l)
return;
if (L == R){
d[node] /= val;
return;
}
ll mid = (L + R) / 2;
updater(node*2, L, mid, l, r, val);
updater(node*2 + 1, mid + 1, R, l, r, val);
d[node] = d[node*2] + d[node*2+1];
}
void update2(ll v,ll l,ll r,ll pos){
if(pos<l||r<pos) return;
if(l==r){
d[v]/=k;
return;
}
ll m=(l+r)>>1;
update2(v*2,l,m,pos);
update2(v*2+1,m+1,r,pos);
d[v]=d[v*2]+d[v*2+1];
}
};
ll dp[2005][2005];
int main() {
ll n,p,q;
cin >> n >> p >> q;
p = min(p,n);
q = min(q,n);
ll a[n];
for(ll i = 1; i <= n; i++)cin >> a[i];
sort(a,a+n);
ll x[2005],y[2005] ;
ll l = 0,r = 1000000000;
ll ans ;
while(l < r){
ll w = (l+r)/2;
memset(dp,0,sizeof dp);
for(ll i = 1, j = 1; i <= n; i++) {
while(a[j] - a[i] < w && j <= n) ++j;
x[i] = --j;
}
for(ll i = 1, j = 1; i <= n; i++) {
while(a[j] - a[i] < w+w && j <= n) ++j;
y[i] = --j;
}
x[n+1] = n;
y[n+1] = n;
for(ll i = 0; i <= p; i++){
for(ll j = 0 ; j <= q; j++){
if(i < p)dp[i+1][j] = max(dp[i+1][j],x[dp[i][j]+1]);
if(j < q)dp[i][j+1] = max(dp[i][j+1],y[dp[i][j]+1]);
}
}
if(dp[p][q]>= n){
r = w;
ans = w;
}
else l = w+1;
}
cout << ans;
}
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