From d8f3b40085619cb680c8f227c65a1f5acc393223 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Tue, 23 Feb 2021 21:07:19 +0800
Subject: Move leetcode solutions to subdir.

---
 leetcode/cpp/260.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 leetcode/cpp/260.cpp

(limited to 'leetcode/cpp/260.cpp')

diff --git a/leetcode/cpp/260.cpp b/leetcode/cpp/260.cpp
new file mode 100644
index 0000000..5679d52
--- /dev/null
+++ b/leetcode/cpp/260.cpp
@@ -0,0 +1,23 @@
+#include <vector>
+#include <unordered_set>
+
+using std::vector;
+
+class Solution
+{
+public:
+    vector<int> singleNumber(vector<int> &nums)
+    {
+        std::unordered_set<int> s;
+        for (auto i : nums)
+        {
+            const auto result = s.find(i);
+            if (result == s.cend())
+                s.insert(i);
+            else
+                s.erase(result);
+        }
+
+        return vector<int>(s.cbegin(), s.cend());
+    }
+};
-- 
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