摘要： 题目描述 Farmer John is planning to build N (2 <= N <= 50,000) square fenced-in pastures on his farm, each of size exactly K x K (1 <= K <= 1,000,000). Pa 阅读全文

摘要： 题目描述 The first stage of train system reform (that has been described in the problem Railways of the third stage of 14th Polish OI. However, one needs 阅读全文