摘要:        
题目描述: There are n bulbs that are initially off. You first turn on all the bulbs. Then, you turn off every second bulb. On the third round, you toggle     阅读全文
        
            posted @ 2016-06-05 20:04
赵俊庭
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            posted @ 2016-06-05 19:53
赵俊庭
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