2017年10月11日
线段树 - 区间上的点更新
摘要： A lot of battleships of evil are arranged in a line before the battle. Our commander decides to use our secret weapon to eliminate the battleships. Ea 阅读全文
posted @ 2017-10-11 20:03 楼主好菜啊 阅读(176) 评论(0) 推荐(0)