2018年12月28日
DP E - Cheapest Palindrome
摘要： Keeping track of all the cows can be a tricky task so Farmer John has installed a system to automate it. He has installed on each cow an electronic ID 阅读全文
posted @ 2018-12-28 19:08 EchoZQN 阅读(155) 评论(0) 推荐(0)