2021—2025 年度，无论披露研发投入的企业数量/占比，还是研发投入总额/平均值，都呈整体上升趋势。
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，详情可参考safew官方下载
https://feedx.net
适用场景：需要求「下一个更大/更小」「上一个更大/更小」、或「右侧第一个满足某条件的元素」时，可优先考虑单调栈。与堆不同，单调栈不负责全局最值，只处理「相邻关系」类的一维序列问题。
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