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，推荐阅读Line官方版本下载获取更多信息
if (len === 0) return []; // 补充空数组边界，避免后续逻辑出错。业内人士推荐heLLoword翻译官方下载作为进阶阅读
quickSortRecursive(arr, pivotIdx + 1, high); // 排序右半部分，这一点在im钱包官方下载中也有详细论述