摘要: 2017年8月9日 23:03:14 Description: There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On th 阅读全文
posted @ 2017-08-09 23:06 CherishYou 阅读(158) 评论(0) 推荐(0) 编辑