add: 220329 [cpp]

cpp/2203/220329.cpp

@@ -0,0 +1,15 @@
+#include <vector>
+#include <bitset>
+
+class Solution {
+public:
+	static int findDuplicate(const std::vector<int>& nums) {
+		std::bitset<100008> s;
+		for (int i : nums) {
+			if (s[i])
+				return i;
+			s[i] = true;
+		}
+		return -1;
+	}
+};

cpp/2203/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220328.cpp)
+ADD_EXECUTABLE(2203 220329.cpp)