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This tactic is echoed by the NHS, as seen in their recent Hope Takes Flight campaign, urging families to talk about organ donation before its too late.
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)。