From f385d08b6d1c812e5271ca8b80d18beeea7cbfaa Mon Sep 17 00:00:00 2001
From: Baoshuo <i@baoshuo.ren>
Date: Mon, 9 May 2022 19:21:06 +0800
Subject: [PATCH] =?UTF-8?q?820.=20=E9=80=92=E5=BD=92=E6=B1=82=E6=96=90?=
 =?UTF-8?q?=E6=B3=A2=E9=82=A3=E5=A5=91=E6=95=B0=E5=88=97?=
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https://www.acwing.com/problem/content/submission/code_detail/14063990/
---
 AcWing/820/820.cpp | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 AcWing/820/820.cpp

diff --git a/AcWing/820/820.cpp b/AcWing/820/820.cpp
new file mode 100644
index 00000000..adcdd271
--- /dev/null
+++ b/AcWing/820/820.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+
+using std::cin;
+using std::cout;
+const char endl = '\n';
+
+int f(int x) {
+    return x == 1 || x == 2 ? 1 : f(x - 1) + f(x - 2);
+}
+
+int n;
+
+int main() {
+    std::ios::sync_with_stdio(false);
+
+    cin >> n;
+    cout << f(n) << endl;
+
+    return 0;
+}