add: 220301 [cpp]

cpp/2203/220301.cpp

@@ -0,0 +1,24 @@
+#include <vector>
+#include <cstdio>
+
+/**
+ * 338. Counting Bits
+ * Given an integer n, return an array ans of length n + 1 such that for each i (0 <= i <= n), ans[i] is the number of 1's in the binary representation of i.
+ */
+
+class Solution {
+public:
+	static std::vector<int> countBits(int n) {
+		std::vector<int> ans(n + 1);
+		for (int i = 0; i <= n; ++i)
+			ans[i] = __builtin_popcount(i);
+		return ans;
+	}
+};
+
+int main() {
+	auto ret = Solution::countBits(5);
+	for (int i : ret)
+		std::printf("%d ", i);
+	return 0;
+}

cpp/2203/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2203)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2203 220301-CN.cpp)
+ADD_EXECUTABLE(2203 220301.cpp)