qq_19327307的专栏

DescriptionHave you heard the fact "The base of every normal number system is 10" ? Of course, I am not talking about number systems like Stern Brockot Number System. This problem has nothing to

DescriptionWe say that x is a perfect square if, for some integer b, x = b 2. Similarly, x is a perfect cube if, for some integer b, x = b 3. More generally, x is a perfect pth power if, for s

Description反正切函数可展开成无穷级数，有如下公式 (其中0 使用反正切函数计算PI是一种常用的方法。例如，最简单的计算PI的方法： PI=4arctan(1)=4(1-1/3+1/5-1/7+1/9-1/11+...) 公式(2) 然而，这种方法的效率很低，但我们可以根据角度和的正切函数公式： tan(a+b)=[tan(a)+tan

DescriptionThe most important part of a GSM network is so called Base Transceiver Station (BTS). These transceivers form the areas called cells (this term gave the name to the cellular phone) and

DescriptionThere are n people standing in a row. And There are m numbers, 1.2...m. Every one should choose a number. But if two persons standing adjacent to each other choose the same number

DescriptionThe summer training of ZJU ICPC in July is about to end. To celebrate this great and happy day, the coaches of ZJU ICPC TeamNavi and Fancy decided to BG everyone! Beside the two

DescriptionThe expression N!, read as "N factorial," denotes the product of the first N positive integers, where N is nonnegative. So, for example,N N! 0 1 1 1 2 2 3 6 4 24 5