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。
另外，在秘鲁要想获得一座房屋建造许可证，需要花6年零11个月的时间，与52个政府部门打交道，完成207道行政手续；而要想得到那块土地的合法所有权凭证，需要完成728道手续；私营公共汽车、小公共汽车和出租车司机，要想获得运营路线的官方许可，要用26个月完成官僚主义者的层层规定。
。夫子对此有专业解读
The storefront designs are clean, but they're not unique templates for creating a completely different brand image.
The Test PLA resolves complex privilege decisions in a single evaluation using 148 product terms, with a 3-delay-slot pipeline to overlap checks with useful work. The PTSAV/PTOVRR mechanism lets one shared subroutine serve dozens of callers with different validation rules.
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