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Cycle diff mode (unified / full-context / raw)。heLLoword翻译官方下载对此有专业解读
This was Collins's last flight. She tells us that she always planned to stop after her fourth mission - to give others a chance to go to space.。WPS官方版本下载对此有专业解读
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。
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