add: 220315-CN [cpp]

cpp/2203/220315-CN.cpp

@@ -0,0 +1,18 @@
+#include <vector>
+
+class Solution {
+public:
+	static int countMaxOrSubsets(const std::vector<int>& nums) {
+		int maxOr = 0;
+		for (int i : nums)
+			maxOr |= i;
+		int n = nums.size(), LIM = 1 << n, ret = 0;
+		for (int i = 1; i < LIM; ++i) {
+			int ans = 0;
+			for (int j = 0; j < n; ++j)
+				ans |= ((1 << j) & i) ? nums[j] : 0;
+			ret += ans == maxOr;
+		}
+		return ret;
+	}
+};

cpp/2203/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220314-CN.cpp)
+ADD_EXECUTABLE(2203 220315-CN.cpp)