From 979062297ebd0439929edd4e8d38ef1a62c1d201 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Sat, 1 Aug 2020 17:01:09 +0800
Subject: import(solutions): Add problem que-shi-de-shu-zi-lcof .

---
 works/solutions/cpp/que-shi-de-shu-zi-lcof.cpp | 29 ++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 works/solutions/cpp/que-shi-de-shu-zi-lcof.cpp

(limited to 'works/solutions/cpp')

diff --git a/works/solutions/cpp/que-shi-de-shu-zi-lcof.cpp b/works/solutions/cpp/que-shi-de-shu-zi-lcof.cpp
new file mode 100644
index 0000000..1cb3e01
--- /dev/null
+++ b/works/solutions/cpp/que-shi-de-shu-zi-lcof.cpp
@@ -0,0 +1,29 @@
+#include <vector>
+
+using std::vector;
+
+class Solution
+{
+public:
+    int missingNumber(vector<int> &nums)
+    {
+        if (nums.back() == nums.size() - 1)
+            return nums.size();
+
+        int low = 0, high = nums.size() - 1;
+        while (low != high)
+        {
+            int middle = (low + high) / 2;
+            if (middle == nums[middle])
+            {
+                low = middle + 1;
+            }
+            else
+            {
+                high = middle;
+            }
+        }
+
+        return low;
+    }
+};
-- 
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