摘要:
Problem DescriptionThere are many lamps in a line. All of them are off at first. A series of operations are carried out on these lamps. On the i-th operation, the lamps whose numbers are the multiple of i change the condition ( on to off and off to on ).InputEach test case contains only a number n ( 阅读全文
posted @ 2013-07-13 11:11
cheng_you_know
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