add: 220511 [cpp]

cpp/2205/220511.cpp

@@ -0,0 +1,23 @@
+#include <cstdio>
+
+/**
+ * 1641. Count Sorted Vowel Strings
+ *
+ * Given an integer n, return the number of strings of length n that consist only of vowels (a, e, i, o, u) and are lexicographically sorted.
+ * A string s is lexicographically sorted if for all valid i, s[i] is the same as or comes before s[i+1] in the alphabet.
+ */
+
+class Solution {
+public:
+	static int countVowelStrings(int n) {
+		int ans[5]{1, 1, 1, 1, 1};
+		while (--n)
+			ans[4] += (ans[3] += (ans[2] += ++ans[1]));
+		return ans[0] + ans[1] + ans[2] + ans[3] + ans[4];
+	}
+};
+
+int main() {
+	std::printf("%d\n", Solution::countVowelStrings(33));
+	return 0;
+}

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220511-CN.cpp)
+ADD_EXECUTABLE(2205 220511.cpp)