摘要： " 题目链接 " Problem Description The center coordinate of the circle C is O, the coordinate of O is (0,0) , and the radius is r. P and Q are two points no 阅读全文

摘要： " 题目链接 " Problem Description Alice and Bob are playing a game called 'Gameia ? Gameia !'. The game goes like this : 0. There is a tree with all node u 阅读全文

摘要： " 题目链接 " Problem Description We define the distance of two strings A and B with same length n is disA,B=∑i=0n−1|Ai−Bn−1−i| The difference between the 阅读全文