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题目描述 题解 AC代码 题目描述 An elevation of a collection of buildings is an orthogonal projection of the buildings onto a vertical plane. An external elevation of a city would show the skyline and ...

题目描述 题解 floodfill 离散化 unique函数 AC代码 题目描述 Imagine a box, made of copper plate. Imagine a second one, intersecting the first one, and several others, intersecting each other (or not)....