#include "bits/stdc++.h"
using namespace std;
#define task ""
#define ll long long
#define endl '\n'
#define fi first
#define se second
#define vall(a) (a).begin(), (a).end()
#define sze(a) (int)a.size()
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ep emplace_back
#define pb push_back
#define pf push_front
const ll mod = 1e9 + 7;
const int N = 2005;
const int oo = 1e9;
bool START;
int n, p, q, a[N];
int dp[N][N];
ll nxtp[N], nxtq[N];
int f(int pos, int need) {
if (pos == n + 1) return 0;
int &res = dp[pos][need];
if (res != -1) return res;
res = oo;
int pos_ = nxtq[pos];
if (need < q && pos_ != pos) res = min(res, f(pos_, need + 1));
pos_ = nxtp[pos];
if (pos_ != pos) res = min(res, f(pos_, need) + 1);
return res;
}
bool check(int x) {
for (int i = 1; i <= n; ++i) {
nxtp[i] = upper_bound(a + 1, a + 1 + n, a[i] + x - 1) - a;
nxtq[i] = upper_bound(a + 1, a + 1 + n, a[i] + (x << 1) - 1) - a;
}
memset(dp, -1, sizeof(dp));
return (f(1, 0) <= p);
}
int cnp() {
ll l = 1, r = oo, ans = oo;
while(l <= r) {
int mid = (l + r) >> 1;
if (check(mid)) {
ans = mid;
r = mid - 1;
} else {
l = mid + 1;
}
}
return ans;
}
inline void solve() {
cout << cnp();
}
inline void input() {
cin >> n >> p >> q;
for (int i = 1; i <= n; ++i) cin >> a[i];
return solve();
}
bool END;
int main() {
if(fopen(task ".inp", "r")) {
freopen(task ".inp", "r", stdin);
freopen(task ".out", "w", stdout);
}
ios_base::sync_with_stdio(false);
cin.tie(nullptr); cout.tie(nullptr);
input();
cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl;
cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n";
return 0;
}
Compilation message (stderr)
watching.cpp: In function 'int main()':
watching.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
85 | freopen(task ".inp", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
watching.cpp:86:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
86 | freopen(task ".out", "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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