思路：先对 nums2 用单调栈求每个元素的下一个更大值，存入 Map 缓存；再遍历 nums1 直接查 Map 得结果。时间复杂度 O(len1 + len2)。
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The most common task with streams is reading them to completion. Here's what that looks like with Web streams:。heLLoword翻译官方下载是该领域的重要参考
Reports with charts and graphs