摘要：http://codeforces.com/problemset/problem/1166/C 分析：给定n 个数，其中有x,y,... 满足 min(∣x−y∣,∣x+y∣) ≤ min(∣x∣,∣y∣)且 max(∣x∣,∣y∣) ≤ max(∣x−y∣,∣x+y∣) http://codefo 阅读全文

摘要：构造算法是什么 It's an algorithm which builds something. A graph, an array, a matrix etc. It's what test generators use to build test cases. 就是数学中的proof， con 阅读全文