add: 221023-CN

cpp/2210/221023-CN.cpp

@@ -0,0 +1,26 @@
+#include <string>
+
+/**
+ * 1768. Merge Strings Alternately
+ *
+ * You are given two strings word1 and word2. Merge the strings by adding letters in alternating order, starting with word1. If a string is longer than the other, append the additional letters onto the end of the merged string.
+ * Return the merged string.
+ */
+
+class Solution {
+public:
+	static std::string mergeAlternately(const std::string& s, const std::string& t) {
+		const char* sp = s.c_str(), * tp = t.c_str();
+		std::string ret;
+		ret.reserve(s.length() + t.length());
+		while (*sp && *tp) {
+			ret.push_back(*(sp++));
+			ret.push_back(*(tp++));
+		}
+		while (*sp)
+			ret.push_back(*(sp++));
+		while (*tp)
+			ret.push_back(*(tp++));
+		return ret;
+	}
+};

cpp/2210/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2210)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2210 221022.cpp)
+ADD_EXECUTABLE(2210 221023-CN.cpp)