add: 220407-CN [cpp]

cpp/2204/220407-CN.cpp

@@ -0,0 +1,22 @@
+#include <string>
+
+class Solution {
+public:
+	static bool rotateString(const std::string& s, const std::string& goal) {
+		char ch = s[0];
+		std::size_t n = s.length();
+
+		auto verify = [&](std::size_t p) {
+			for (std::size_t i = 0; i < n; ++i, p = (1 + p) % n)
+				if (s[i] != goal[p])
+					return false;
+			return true;
+		};
+
+		std::size_t pos = 0;
+		for (std::size_t nextPos = goal.find(ch, pos); nextPos != std::string::npos; nextPos = goal.find(ch, pos = nextPos + 1))
+			if (verify(nextPos))
+				return true;
+		return false;
+	}
+};

cpp/2204/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2204)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2204 220406-CN.cpp)
+ADD_EXECUTABLE(2204 220407-CN.cpp)