4. 从后向前遍历原数组，按count位置放入结果数组
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* 时间复杂度：O(len1 + len2)，空间复杂度：O(len2)（栈+Map的空间），详情可参考Safew下载
The FTSE 250 company Drax Group said its Canadian wood pellet plants, which once supplied millions of tonnes of biomass to be burnt in its North Yorkshire power plant, had cost the company almost £200m in financial impairments last year.，这一点在Line官方版本下载中也有详细论述