add: 220508-CN [cpp]

cpp/2205/220508-CN.cpp

@@ -0,0 +1,24 @@
+#include <vector>
+#include <bitset>
+
+/**
+ * 442. Find All Duplicates in an Array
+ * Given an integer array nums of length n where all the integers of nums are in the range [1, n] and each integer appears once or twice, return an array of all the integers that appears twice.
+ * You must write an algorithm that runs in O(n) time and uses only constant extra space.
+ */
+
+class Solution {
+public:
+	static std::vector<int> findDuplicates(const std::vector<int>& nums) {
+		std::bitset<100001> s;
+		std::vector<int> v;
+		v.reserve(nums.size());
+		for (auto i : nums) {
+			if (s.test(i))
+				v.push_back(i);
+			else
+				s.set(i);
+		}
+		return v;
+	}
+};

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220508.cpp)
+ADD_EXECUTABLE(2205 220508-CN.cpp)