思路：单调递减栈，找「上一个比当前价格大的元素索引」。正序遍历，弹出所有 ≤ 当前价格的索引；跨度 = 当前索引 - 栈顶索引（栈空则为 当前索引 + 1）。
# Word-level timestamps，这一点在爱思助手下载最新版本中也有详细论述
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The Kodak Smile Plus is another hybrid instant camera that allows you to print smartphone photos. It’s smaller and less expensive than Kodak’s Mini Shot 3 Retro 3 at $129.99, and it’s available in a variety of vibrant colors that should appeal to children. It also comes with a physical filter-changing lens and prints on Zinc paper, allowing you to use your photos as stickers.