输入：nums = [2,1,2,4,3]
What we see is that there are in fact two entangled traditions of “knocking on things for good luck”: touching iron, and touching wood. We also find that they are widely distributed, but also have a pretty clear cluster around the Mediterranean and Europe.
。关于这个话题，safew官方版本下载提供了深入分析
In practice, this means:，更多细节参见同城约会
Additional_Beloved