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The LiPlay Plus also includes some fun extra features, such as a layered photo mode that combines images from both cameras into a single shot. It can also record short audio clips, which are saved as a QR code you can place in a corner of the printed photo. Both features are enjoyable to play with, though the layered photo mode can, admittedly, come off as gimmicky. You’re basically just dropping a selfie onto a background image with no way to reposition or resize it.
栈（stack）是先进后出的数据结构。单调栈在入栈时通过一定规则保持栈内元素有序（单调递增或单调递减），从而把「找左侧/右侧第一个更大/更小元素」从 O(n²) 降到 O(n)。