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.
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* 核心：倒序遍历2倍长度 + 取模模拟循环 + 单调栈，解决「首尾相连」的更大值问题，更多细节参见搜狗输入法2026
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