V2EX monotone chain

Monotone Chain

释义 Definition

Monotone chain(单调链/单调链法):计算几何中常用的凸包(convex hull)构造方法(也常指“Andrew 单调链算法”)。它通常先按坐标排序点集,然后分别构建下凸包上凸包,利用叉积判断转向并移除不满足凸性的点,最终合并得到凸包。

发音 Pronunciation (IPA)

/mnton ten/

例句 Examples

We used the monotone chain algorithm to compute the convex hull.
我们使用单调链算法来计算凸包。

After sorting the points by x-coordinate (and y as a tie-breaker), the monotone chain builds the lower and upper hulls by repeatedly removing points that create a non-left turn.
在按 x 坐标排序(y 坐标作并列比较)后,单调链通过反复删除造成“非左转”的点来构建下凸包与上凸包。

词源 Etymology

Monotone”意为“单调的/单向递增或递减的”,在这里指点按坐标排序后,构造凸包边界时呈现出一种按 x(或 y)方向单调推进的特征;“chain”指边界上一段连续连接的点(像链条一样)。因此“monotoe chain”直观上就是“沿某个方向单调推进的一条边界链”。

相关词 Related Words

文学与著作出现 Literary Works

  • Computational Geometry: Algorithms and Applications(Mark de Berg 等):在凸包章节常提到或等价介绍单调链式的凸包构造思路。
  • Competitive Programming 3(Steven Halim 等):在凸包实现部分常以“Monotone Chain / Andrew’s algorithm”名义出现。
  • CP Algorithms(在线算法手册,常被引用为“cp-algorithms”):凸包条目中以“Monotone chain”作为标准实现方法之一。
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