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CountPrimes related Code

Source: Internet
Author: User
Keywords CountPrimes
Tags class code coding import return type
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CountPrimes

#-*-coding:utf-8-*-Import Math class Solution (object): Def countprimes (self, N): "": Type N:int:rtype:int "" "If n<=2: return 0 count=0 isprimes=[true]*n# to establish N-element list Isprimes[0]=false Isprimes[1]=false #2, 3 are prime #print isprimes Q=int ( MATH.SQRT (n) +1) #开方 to I in range (2,Q): If isprimes[i]==true: #i是素数 j=i*i #那么i *i is not prime, that is, J is not prime while J

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