add: 220606_CN

cpp/2206/220606-CN.cpp

@@ -0,0 +1,28 @@
+#include <map>
+
+/**
+ * 732. My Calendar III
+ * A k-booking happens when k events have some non-empty intersection (i.e., there is some time that is common to all k events.)
+ * You are given some events [start, end), after each given event, return an integer k representing the maximum k-booking between all the previous events.
+ * Implement the MyCalendarThree class:
+ * MyCalendarThree() Initializes the object.
+ * int book(int start, int end) Returns an integer k representing the largest integer such that there exists a k-booking in the calendar.
+ */
+
+class MyCalendarThree {
+private:
+	std::map<int, int> m;
+
+public:
+	MyCalendarThree() = default;
+
+	int book(int start, int end) {
+		// mb: currently, 0 -> idx, the maximum books
+		int ans = 0, mb = 0;
+		++m[start];
+		--m[end];
+		for (const auto& [idx, freq] : m)
+			ans = std::max(mb += freq, ans);
+		return ans;
+	}
+};

cpp/2206/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2206)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2206 220605-CN.cpp)
+ADD_EXECUTABLE(2206 220606-CN.cpp)