From e63bc3ff36991288bbbf14a71da62eaef9105eef Mon Sep 17 00:00:00 2001
From: Ren Baoshuo <i@baoshuo.ren>
Date: Thu, 16 Sep 2021 16:17:16 +0800
Subject: [PATCH] =?UTF-8?q?68.=200=E5=88=B0n-1=E4=B8=AD=E7=BC=BA=E5=A4=B1?=
 =?UTF-8?q?=E7=9A=84=E6=95=B0=E5=AD=97?=
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https://www.acwing.com/problem/content/submission/code_detail/7757230/
---
 AcWing/68/68.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 AcWing/68/68.cpp

diff --git a/AcWing/68/68.cpp b/AcWing/68/68.cpp
new file mode 100644
index 00000000..4cee14c4
--- /dev/null
+++ b/AcWing/68/68.cpp
@@ -0,0 +1,13 @@
+class Solution {
+  public:
+    int getMissingNumber(vector<int>& nums) {
+        set<int> s;
+        for (int i = 0; i <= nums.size(); i++) {
+            s.insert(i);
+        }
+        for (int i : nums) {
+            s.erase(i);
+        }
+        return *s.begin();
+    }
+};