#include <bits/stdc++.h> using namespace std; #define ll long long #define ar array #define all(x) x.begin(), x.end() const int inf = 2e9 + 5; void solve() { int n, p, q; cin >> n >> p >> q; vector<int> a(n); for (int i = 0; i < n;i++) cin >> a[i]; if (p + q >= n) return (void)(cout << 1); // a.insert(a.begin(), 0); a.push_back(0); sort(a.begin(), a.end()); vector dp(n + 1, vector(q + 1, p + 5)); deque<ar<int, 2>> sm[q + 1], big[q + 1]; auto f = [&](int w) { for (int i = 0; i <= n;i++) for (int j = 0; j <= q;j++) dp[i][j] = p + 10; dp[0].assign(q + 1, 0); for (int i = 0; i <= q;i++) { while (!sm[i].empty()) sm[i].pop_back(); while (!big[i].empty()) big[i].pop_back(); } for (int i = 1; i <= n;i++) { for (int j = 0; j <= q;j++) { while (!sm[j].empty()) { auto [x, id] = sm[j].front(); if (a[i] - a[id] + 1 <= w) break; sm[j].pop_front(); } while (!big[j].empty()) { auto [x, id] = big[j].front(); if (a[i] - a[id] + 1 <= w * 2) break; big[j].pop_front(); } while (!sm[j].empty()) { auto [x, id] = sm[j].back(); if (x < dp[i - 1][j]) break; sm[j].pop_back(); } while (!big[j].empty()) { auto [x, id] = big[j].back(); if (x < dp[i - 1][j]) break; big[j].pop_back(); } sm[j].push_back({dp[i - 1][j], i}); big[j].push_back({dp[i - 1][j], i}); if (!sm[j].empty()) dp[i][j] = min(dp[i][j], (*sm[j].begin())[0] + 1); if (j > 0 && !big[j - 1].empty()) dp[i][j] = min(dp[i][j], (*big[j - 1].begin())[0]); } } int ans = *min_element(dp[n].begin(), dp[n].end()); return ans; }; int l = 1, r = 1e9, ans = 1e9; while (l <= r) { int m = (l + r) / 2; if (f(m) <= p) r = m - 1, ans = m; else l = m + 1; } cout << ans; } signed main() { ios :: sync_with_stdio(false); cin.tie(nullptr); int t = 1; // cin >> t; while (t--) { solve(); cout << "\n"; } return 0; }