const i = this.arr.length - 1;
S&P 500 Index futures are down 0.5% as of 7:39 a.m. in New York, set to notch a monthly loss.
，更多细节参见heLLoword翻译官方下载
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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)。
▲图片来源：https://x.com/Prathkum/status/2027069198091071664/photo/2