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这什么鬼题网上的做法千篇一律 自己yy了一种利用线性筛思想+矩阵乘法的做法 复杂度最坏是O(30*30*9) 这tm怎么就T了！！！！！难道时间限制是摆设么！ 难道说就只能用那一种方法才能ac！！！！ 什么鬼题 Followed by:
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