2017年2月15日
（线段树）poj2828-Buy Tickets
摘要： Railway tickets were difficult to buy around the Lunar New Year in China, so we must get up early and join a long queue… The Lunar New Year was approa 阅读全文
posted @ 2017-02-15 21:03 perplex 阅读(197) 评论(0) 推荐(0) 编辑