From b605576bc0d17ab9433128f5d05815abff091985 Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Wed, 30 Dec 2020 21:17:21 +0800
Subject: [PATCH] =?UTF-8?q?P3853=20[TJOI2007]=E8=B7=AF=E6=A0=87=E8=AE=BE?=
 =?UTF-8?q?=E7=BD=AE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

R44439758
---
 problem/P3853/P3853.cpp | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 problem/P3853/P3853.cpp

diff --git a/problem/P3853/P3853.cpp b/problem/P3853/P3853.cpp
new file mode 100644
index 00000000..70b2adca
--- /dev/null
+++ b/problem/P3853/P3853.cpp
@@ -0,0 +1,30 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int l, r, n, k, a[100005];
+
+bool check(int mid) {
+    int m = 0;
+    for (int i = 2; i <= n; i++) {
+        if (a[i] - a[i - 1] >= mid) {
+            m += (a[i] - a[i - 1]) / mid;
+            if ((a[i] - a[i - 1]) % mid == 0) m--;
+        }
+    }
+    return m <= k;
+}
+
+int main() {
+    cin >> r >> n >> k;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+    while (l < r) {
+        int mid = l + r >> 1;
+        if (check(mid)) r = mid;
+        else l = mid + 1;
+    }
+    cout << l << endl;
+    return 0;
+}