#include <bits/stdc++.h>
using namespace std;
#define N 2001
int dp[N][N];
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, p, q;
cin >> n >> p >> q;
vector<int> a(n);
for (int &i : a) cin >> i;
sort(a.begin(), a.end());
p = min(p, n);
q = min(q, n);
auto can = [&](int m) {
for (int i = 0; i < n; i++) {
for (int j = 0; j <= p; j++) {
dp[i][j] = q + 1;
}
}
for (int l = 0, r = 0, k = 0; r < n; r++) {
while (a[r] - a[l] + 1 > m) l++;
while (a[r] - a[k] + 1 > 2 * m) k++;
if (l == 0) {
dp[r][0] = 1;
dp[r][1] = 0;
}
else {
if (k == 0) {
dp[r][0] = 1;
for (int i = 1; i <= p; i++) {
dp[r][i] = min(dp[r][i], dp[l - 1][i - 1]);
}
}
else {
for (int i = 1; i <= p; i++) {
dp[r][i] = min(dp[r][i], dp[l - 1][i - 1]);
}
for (int i = 0; i <= p; i++) {
if (dp[k - 1][i] < q) dp[r][i] = min(dp[r][i], dp[k - 1][i] + 1);
}
}
}
}
return *min_element(dp[n - 1], dp[n - 1] + p + 1) <= q;
};
int l = 0, r = 1e9 + 1;
while (r - l > 1) {
int m = (l + r) >> 1;
if (can(m)) r = m;
else l = m;
}
cout << r;
return 0;
}
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