self.file.flush()
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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In achieving his dream to be a rocket scientist, he would become an American hero. But it was not going to be easy.，推荐阅读heLLoword翻译官方下载获取更多信息
Water resistance: IP54 (splash resistant)
For UNSAT problems with 10 variables and 200 clauses it had the same issue as others: making up assignments.