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)。
Anthropic 在今年 1 月发布的经济影响指数报告给出了更具体的数字支撑。报告通过分析 100 万条真实对话，估算了 Claude 在不同职业中能够有效承接的工作比例。
。关于这个话题，safew官方下载提供了深入分析
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Equal (0): Everything in this space must be equal to 0. The answer is 0-0, placed horizontally; 3-0, placed vertically.
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