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)。
I'm in Shadow Robot's north London headquarters, looking at their latest robotic hands.
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保持足够的耐心：实话说我不属于耐心特别好的人。这几年逐渐控制自己的情绪，但有时候看到她做不好事情、看到她任性耍小脾气，我还是会忍不住发脾气，还是会批评她、催促她。希望新的一年，我会更好的保持耐心，引导孩子帮助她成长。
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SSIM (Structural Similarity Index Measure) compares two images by evaluating luminance, contrast, and structural patterns across local windows. It returns a score from -1 to 1: 1.0 means the images are pixel-identical, 0 means no structural correlation, and negative values mean the images are anti-correlated (less alike than random noise). For glyph comparison, it answers the question: do these two rendered characters share the same visual structure?