[Swift]LeetCode218. 天际线问题 | The Skyline Problem

A city's skyline is the outer contour of the silhouette formed by all the buildings in that city when viewed from a distance. Now suppose you are given the locations and height of all the buildings as shown on a cityscape photo (Figure A), write a program to output the skylineformed by these buildings collectively (Figure B).A city's skyline is the outer contour of the sil