add: 220705-CN

cpp/2207/220705-CN.cpp

@@ -0,0 +1,33 @@
+#include <set>
+#include <utility>
+
+/**
+ * 729. My Calendar I
+ * You are implementing a program to use as your calendar. We can add a new event if adding the event will not cause a double booking.
+ * A double booking happens when two events have some non-empty intersection (i.e., some moment is common to both events.).
+ * The event can be represented as a pair of integers start and end that represents a booking on the half-open interval [start, end), the range of real numbers x such that start <= x < end.
+ * Implement the MyCalendar class:
+ * MyCalendar() Initializes the calendar object.
+ * boolean book(int start, int end) Returns true if the event can be added to the calendar successfully without causing a double booking. Otherwise, return false and do not add the event to the calendar.
+ */
+
+class MyCalendar {
+private:
+	std::set<std::pair<int, int>> s;
+
+public:
+	MyCalendar() = default;
+
+	bool book(int start, int end) {
+		if (s.empty()) {
+			s.insert({start, end});
+			return true;
+		}
+		auto it = s.lower_bound({end, -1});
+		if (it == s.begin() || std::prev(it)->second <= start) {
+			s.insert({start, end});
+			return true;
+		}
+		return false;
+	}
+};

cpp/2207/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2207)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2207 220704-CN.cpp)
+ADD_EXECUTABLE(2207 220705-CN.cpp)