* 时间复杂度：O(n log n)（主要来自排序），空间复杂度：O(n)
玻利维亚国防部证实事故，国防部长表示正在调查事故原因，初步指向恶劣天气条件导致降落困难，安全部队（军队、警察和消防人员）已全面接管现场，一方面开展救援，另一方面全力回收散落的钞票。。爱思助手下载最新版本是该领域的重要参考
[5] L. Liang & D. Hale: “A stable and fast implementation of natural neighbour。51吃瓜对此有专业解读
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