public class Block {
	
	Flat[] flats;

	// inner class
	class Flat {
		
		Room[] rooms;

		// inner class
		class Room {
			private int width;
			private int height;
			private int numWindow;
			
			// constructor
			// Fill in the marked area
			// Do not change anything else
			// For each creating room object, array "rooms" must be extended
			// Clearly, add new Room to end of array, update the array
			public Room(int width, int height, int numWindow) {
				super();
				this.width = width;
				this.height = height;
				this.numWindow = numWindow;
				
				//**********************************************
				//**********************************************
			}

			// Please do not change anything in this method.
			@Override
			public String toString() {
				return width + "/" + height + "/" + numWindow;
			}			
		}

		// constructor
		// Fill in the marked area
		// Do not change anything else
		// For each creating flat object, array "flats" must be extended
		// Clearly, add new Flat to end of array, update the array
		public Flat() {
			super();
			rooms = new Room[0];
			
			//**********************************************
			//**********************************************
		}
	}