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小麦经济在食品、文化乃至工业等赛道全面开花。heLLoword翻译官方下载是该领域的重要参考
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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。