add: 220124

2201/220124.cpp

@@ -0,0 +1,30 @@
+#include <cctype>
+#include <algorithm>
+#include <string>
+#include <cstdio>
+
+/**
+ * 520. Detect Capital
+ * We define the usage of capitals in a word to be right when one of the following cases holds:
+ * All letters in this word are capitals, like "USA".
+ * All letters in this word are not capitals, like "leetcode".
+ * Only the first letter in this word is capital, like "Google".
+ * Given a string word, return true if the usage of capitals in it is right.
+ */
+
+class Solution {
+public:
+	static bool detectCapitalUse(const std::string& word) {
+		// auto n = std::count_if(word.begin(), word.end(), [](int x) { return (bool)std::isupper(x); });
+		// Leetcode did not accept direct usage of std::isupper, but MSVC does.
+		const auto n = std::count_if(word.begin(), word.end(), std::isupper);
+		return (word.length() == n) || (!n) || (n == 1 && std::isupper(*word.begin()));
+	}
+};
+
+int main() {
+	std::printf("%s\n", Solution::detectCapitalUse("USA") ? "true" : "false");
+	std::printf("%s\n", Solution::detectCapitalUse("leetcode") ? "true" : "false");
+	std::printf("%s\n", Solution::detectCapitalUse("Google") ? "true" : "false");
+	std::printf("%s\n", Solution::detectCapitalUse("FlaG") ? "true" : "false");
+}

2201/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2201)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2201 220124-CN.cpp)
+ADD_EXECUTABLE(2201 220124.cpp)