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【HDU - 3524】Perfect Squares（找规律，推公式，除法取模）
A number x is called a perfect square if there exists an integer bsatisfying x=b^2. There are many beautiful theorems about perfect squares in mathematics. Among which, Pythagoras Theorem is the mos...原创 2019-04-21 16:26:14 · 332 阅读 · 0 评论 -
【HDU - 1792】A New Change Problem（推公式、互质数的最大不能表示数）
Now given two kinds of coins A and B,which satisfy that GCD(A,B)=1.Here you can assume that there are enough coins for both kinds.Please calculate the maximal value that you cannot pay and the total n...原创 2019-04-27 22:02:11 · 316 阅读 · 0 评论