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其实很简单，看似N复杂思想方法: a1,a2,a3…………an为必败点<=>当n为偶数时，对a1--an进行从小到大或从大到小排序，如果有a1=a2,a3=a4,…………an-1=an, 当n为奇数时以及其它的情况则必胜 Followed by:
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