add: 230829

cpp/2308/LC230829.cpp

@@ -0,0 +1,25 @@
+#include <algorithm>
+#include <cstddef>
+#include <string>
+#include <vector>
+
+class LC230829 {
+public:
+	static int bestClosingTime(const std::string&);
+};
+
+int LC230829::bestClosingTime(const std::string& c) {
+	const std::size_t n = c.size();
+	std::vector<int> prefix(n), suffix(n);
+	prefix[0] = (c[0] == 'N');
+	for (std::size_t i = 1; i < n; ++i)
+		prefix[i] = prefix[i - 1] + (c[i] == 'N');
+	suffix[n - 1] = (c[n - 1] == 'Y');
+	for (std::size_t i = n - 1; i--; )
+		suffix[i] = suffix[i + 1] + (c[i] == 'Y');
+	std::size_t ret = n, sum = std::count(c.begin(), c.end(), 'N');
+	for (std::size_t i = 0; i < n; ++i)
+		if (auto s = prefix[i] + suffix[i] - (c[i] == 'N'); s < sum || (s == sum && i < ret))
+			sum = s, ret = i;
+	return ret;
+}

cpp/2308/defs.h

@@ -21,5 +21,9 @@ public:
 	bool empty();
 };
 
+class LC230829 {
+public:
+	static int bestClosingTime(const std::string&);
+};
 
 #endif //LEETCODE_CPP_DEFS_H