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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。
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跟当年每晚动辄几万相比，如今的夜总会只能放低身价以求生意上门。“以前，夜总会不是一般人消费得起的，进去的人都是有钱有身份，小姐素质也好。现在，人家都看不起你，觉得你是做这行的。”