摘要：
Description Little Johnny has got a new car. He decided to drive around the town to visit his friends. Johnny wanted to visit all his friends, but the 阅读全文
摘要：
[2018 江苏省大学生程序设计大赛] K. 2018 (测试数据范围有扩大) Problem Given a, b, c, d, find out the number of pairs of integers (x, y) where a ≤ x ≤ b, c ≤ y ≤ d and x·y is 阅读全文