add: 220525-CN [cpp]

cpp/2205/220525-CN.cpp

@@ -0,0 +1,19 @@
+#include <string>
+#include <numeric>
+
+/**
+ * 467. Unique Substrings in Wraparound String
+ * We define the string s to be the infinite wraparound string of "abcdefghijklmnopqrstuvwxyz", so s will look like this:
+ * "...zabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcd....".
+ * Given a string p, return the number of unique non-empty substrings of p are present in s.
+ */
+
+class Solution {
+public:
+	static int findSubstringInWraproundString(const std::string& p) {
+		int dp[26]{}, k = 0;
+		for (int i = 0; i < p.length(); ++i)
+			dp[p[i] - 'a'] = std::max(dp[p[i] - 'a'], k = 1 + ((i && (p[i] - p[i - 1] + 26) % 26 == 1) ? k : 0));
+		return std::accumulate(dp, dp + 26, 0);
+	}
+};

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220525.cpp)
+ADD_EXECUTABLE(2205 220525-CN.cpp)