From 7ce65aead5a1b53deab33fb26878da6a0ad9525d Mon Sep 17 00:00:00 2001
From: Baoshuo Ren <i@baoshuo.ren>
Date: Tue, 8 Feb 2022 10:41:58 +0800
Subject: [PATCH] =?UTF-8?q?799.=20=E6=9C=80=E9=95=BF=E8=BF=9E=E7=BB=AD?=
 =?UTF-8?q?=E4=B8=8D=E9=87=8D=E5=A4=8D=E5=AD=90=E5=BA=8F=E5=88=97?=
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https://www.acwing.com/problem/content/submission/code_detail/10688919/
---
 AcWing/799/799.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 AcWing/799/799.cpp

diff --git a/AcWing/799/799.cpp b/AcWing/799/799.cpp
new file mode 100644
index 00000000..09b207a4
--- /dev/null
+++ b/AcWing/799/799.cpp
@@ -0,0 +1,21 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+#define endl '\n'
+
+int n, a[100005], s[100005], ans;
+
+int main() {
+    cin >> n;
+    for (int i = 1; i <= n; i++) {
+        cin >> a[i];
+    }
+    for (int i = 1, j = 1; i <= n; i++) {
+        s[a[i]]++;
+        while (s[a[i]] > 1) s[a[j++]]--;
+        ans = std::max(ans, i - j + 1);
+    }
+    cout << ans << endl;
+    return 0;
+}