add: 230303

cpp/2303/230303.cpp

@@ -0,0 +1,33 @@
+#include <string>
+#include <vector>
+#include <iostream>
+
+/**
+ * 28. Find the Index of the First Occurrence in a String
+ *
+ * Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
+ */
+
+class Solution {
+public:
+	static int strStr(const std::string& s, const std::string& t) {
+		const int m = s.length(), n = t.length();
+		std::vector<int> p(n);
+		for (int i = 1; i < n; ++i) {
+			int j = p[i - 1];
+			for (; j > 0 && t[i] != t[j]; j = p[j - 1]);
+			p[i] = j + (t[i] == t[j]);
+		}
+		for (int i = 0, j = 0; i < m; ++i) {
+			for (; j > 0 && s[i] != t[j]; j = p[j - 1]);
+			if (s[i] == t[j] && ++j >= n)
+				return i - j + 1;
+		}
+		return -1;
+	}
+};
+
+int main() {
+	std::cout << Solution::strStr("busasasasasapsadpp", "sasasasapsad");
+	return 0;
+}

cpp/2303/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2303)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2303 230302.cpp)
+ADD_EXECUTABLE(2303 230303.cpp)