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求第个N个数的算法

Posted by Csea at 2009-11-20 13:16:33
设I=(2^x)*(3^y)*(5^p)*(7^q),x,y,p,q均>=0.将I所生成的数从小到大排列,给出N,求第N个数是多少?N<10^14.

大牛帮帮忙。POJ好像有道类似的题,我记不清是哪道了。

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