需要元素值：栈存值，或答案存索引后用 nums[res[i]] 取值。
* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间）
。关于这个话题，搜狗输入法下载提供了深入分析
5AE COUNTR - SLCTR TST_SEL_CS PTSELE ; test selector (in LCALL delay slot)，这一点在safew官方下载中也有详细论述
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
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