Every point gets examined, regardless of where it sits. Points on the opposite side of the map get the same treatment as points right next to the query region. We're doing a lot of unnecessary work.
排版极其讲究的双页黑白日式漫画,也是手拿把掐。
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// 2. 通用场景: 快速排序(注意随机化避免最坏情况)。业内人士推荐服务器推荐作为进阶阅读
// ⚠️ 易错点2:循环条件写left <= n-1(会导致left+1越界),或把<=写成<(漏判相等的有序情况)