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。
Here's a simple in-memory writer that collects all written data:
。夫子是该领域的重要参考
Mahjong, Sudoku, free crossword, and more: Play games on Mashable
And you won't need to top up manually in the hard to reach corners, this vacuum has edge-to-edge cleaning that makes sure you get a better coverage along walls and corners. It also comes with an OMNI docking Station. Here the vacuum does all its maintenance, including mop washing and drying, water refilling, and dust emptying for up to 150 days. So there's really next to no work for you to do.
春节我们常会遇到需要变焦拍摄的场景，比如拍远处的舞龙舞狮。用原生相机变焦，画质往往惨不忍睹，全是噪点和涂抹感。而 Project Indigo 会在你按下快门的瞬间，在后台拍摄十几张照片进行合成。哪怕你用到 10 倍变焦，它拍出来的画面依然扎实、纯净，没有传统数码变焦的涂抹感。