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)。
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iPhone 17e takes gorgeous photos with excellent detail, including in low light with Night mode. The 48MP Fusion camera enables an optical-quality 2x Telephoto, giving users two cameras in one so they can get closer to the subject and easily frame their shot. Users can shoot sharp photos at up to 48MP resolution, or capture in the 24MP default for incredible image quality at a file size perfect for storing and sharing. Portrait mode improves thanks to an advanced image pipeline, delivering remarkably natural depth and smooth bokeh that gracefully blurs the background while keeping subjects sharp. The advanced pipeline also enables next-generation portraits, so iPhone 17e recognizes people, dogs, and cats, and automatically saves depth information, allowing users to turn photos into beautiful portraits with background blur after capture and to adjust the focus point in the Photos app. The latest generation of HDR captures subjects with true-to-life renderings of skin tones and ensures bright highlights, rich midtones, and deep shadows across the image — all while preserving fine details.