摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=2523 随手练习 阅读全文
摘要：
http://acm.hdu.edu.cn/showproblem.php?pid=1409 没啥好说的，至今也不知道到底错在哪里了，看了discuss才过的 阅读全文
摘要：
大概就是上面这个样子 我们准备 两个半圆，两个大圆，两个小圆，然后稍微的进行覆盖就行~ 阅读全文
摘要：
Arpa has found a list containing n numbers. He calls a list bad if and only if it is not empty and gcd (see notes section for more information) of num 阅读全文
摘要：
You are given set of n points in 5-dimensional space. The points are labeled from 1 to n. No two points coincide. We will call point a bad if there ar 阅读全文
摘要：
Arpa is taking a geometry exam. Here is the last problem of the exam. You are given three points a, b, c. Find a point and an angle such that if we ro 阅读全文
摘要：
Arpa is researching the Mexican wave. There are n spectators in the stadium, labeled from 1 to n. They start the Mexican wave at time 0. At time 1, th 阅读全文