From b3c5de0ceaa1499c31516c68ccc8e9fc109fae59 Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Wed, 30 Dec 2020 18:39:46 +0800
Subject: [PATCH] =?UTF-8?q?P5682=20[CSP-J2019=20=E6=B1=9F=E8=A5=BF]=20?=
 =?UTF-8?q?=E6=AC=A1=E5=A4=A7=E5=80=BC?=
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R44430393
---
 problem/P5682/P5682.cpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 problem/P5682/P5682.cpp

diff --git a/problem/P5682/P5682.cpp b/problem/P5682/P5682.cpp
new file mode 100644
index 00000000..3885fdfe
--- /dev/null
+++ b/problem/P5682/P5682.cpp
@@ -0,0 +1,25 @@
+#include <bits/stdc++.h>
+
+using namespace std;
+
+int n, t, a[200005];
+
+int main() {
+    set<int> s;
+    cin >> n;
+    for (int i = 0; i < n; i++) {
+        cin >> t;
+        s.insert(t);
+    }
+    if (s.size() <= 1) {
+        cout << -1 << endl;
+    }
+    else {
+        t = 0;
+        for (int i : s) {
+            a[++t] = i;
+        }
+        cout << max(a[t - 2], a[t] % a[t - 1]) << endl;
+    }
+    return 0;
+}