Consider including some or all of the following:
// 易错点4：仅处理栈非空的情况，忽略栈空的情况 → 栈空时res[i]会是undefined。搜狗输入法2026是该领域的重要参考
int randomIdx = low + rand() % (high - low + 1);，推荐阅读旺商聊官方下载获取更多信息
圖像來源，Getty Images
A perfectly practicable 1930s technology, but you can already see the downsides.