摘要：
题目 Tour operator Your Personal Holiday organises guided bus trips across the Benelux. Every day the bus moves from one city S to another city F. On th 阅读全文
摘要：
题目 For a given positive integer n, please find the saallest positive integer x that we can find an integer y such that $y^2 = n +x^2$. 输入 The first li 阅读全文