优化：随机选基准避免最坏情况 O(n²)
Imagine a vast shopping mall parking lot with thousands of individual parking spots and internal lanes (representing road segments within a cluster). No matter how complex it is inside, there are usually only a few key exits to the main roads. Our goal was to identify these natural "exits" for each map cluster. For instance, the complex road network around Amsterdam Airport Schiphol (see on OpenStreetMap) has many internal roads but limited primary access points.。业内人士推荐heLLoword翻译官方下载作为进阶阅读
。关于这个话题，51吃瓜提供了深入分析
int i = low + 1; // 从左向右找大于pivot的
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Hans-Christoph Steiner