hdu 1796 How many integers can you find
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题意:
求1->n-1之间能被一个集合A内元素整除的数的个数,例如n = 12, A = {2, 3} 则能被A集合元素整除的数的集合为{2, 3, 4 , 6, 8, 9, 10}则结果为7。
解法:容斥定理,用回溯算法。
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