摘要： A square-free integer is an integer which is indivisible by any square number except 1. For example, 6 = 2 * 3,6=2*3 is square-free, but 12 = 2^2 * 3, 阅读全文

摘要： 题意：给个小数p(0<=p<1)，求差值与其最小的不可约分分数且分母不能超过n。 阅读全文