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Monocarp and Bicarp live in Berland, where every bus ticket consists of n digits (n is an even number). During the evening walk Monocarp and Bicarp...

Monocarp has arranged n colored marbles in a row. The color of the i-th marble is ai. Monocarp likes ordered things, so he wants to rearrange marbles...

> 然而就nm看不懂，先看不懂它的图是啥，又看不懂它的边是啥，现在还是看不懂它的边是咋找出来的。可是咱不想搞不清楚它是干嘛的就直接用啊靠。

设表示将x作分解后对每个质因子作用到1到y上求的乘积。

给出一些点，询问对于点，求其能和已知点形成多少个直角三角形。

Petya recently found a game "Choose a Square". In this game, there are nn points numbered from 11 to nn on an infinite field. The ii-th point has...

Mathematica是个好东西。虽然早有耳闻功能强大，但是没想到强大到这种地步。

自然溢出不会影响低位数据,所以有的时候你不需要取模,而是一个unsigned.