2017年8月31日
Making the Grade POJ - 3666
摘要： A straight dirt road connects two fields on FJ's farm, but it changes elevation more than FJ would like. His cows do not mind climbing up or down a si 阅读全文
posted @ 2017-08-31 15:49 天之道，利而不害 阅读(141) 评论(0) 推荐(0)