摘要：
Problem Description Our geometry princess XMM has stoped her study in computational geometry to concentrate on her newly opened factory. Her factory h 阅读全文
摘要：
A.灰魔法师 题目描述 “White shores, and beyond. A far green country under a swift sunrise.”--灰魔法师 给出长度为n的序列a, 求有多少对数对 (i, j) (1 <= i < j <= n) 满足 ai + aj 为完全平方 阅读全文