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思路：单调递增栈 + k 控制删除次数。高位越小整体越小，遇更小数字时弹出栈顶大数（仅当 k0）；栈空且当前为 0 则跳过（避免前导零）；若遍历完 k 仍0，从末尾再删 k 位。
，这一点在51吃瓜中也有详细论述
2. 从个位开始，对每位进行计数排序（稳定排序）
The Shark vs. Roomba debate is old news. Here's how both robot vacuum brands got dethroned.。业内人士推荐爱思助手下载最新版本作为进阶阅读
arXiv:2602.18602 (cs)
Easy difficulty hints, answers for Feb. 27 PipsEqual (6): Everything in this purple space must be equal to 6. The answer is 6-0, placed horizontally; 6-3, placed vertically.，详情可参考heLLoword翻译官方下载