Created
August 1, 2012 15:34
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Dayly programing (Project Euler:#10)
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#/usr/bin/python | |
import math | |
def is_prime(x): | |
if x < 0: | |
x = -x | |
if x < 2: | |
return False | |
# check the case: x=2,3 | |
if x % 2 == 0: | |
return x == 2 | |
elif x % 3 == 0: | |
return x == 3 | |
root = int(math.floor(math.sqrt(x))) + 1 | |
# Prime = 6k-1 or 6k+1 | |
pri = 5 | |
height = 2 | |
while pri <= root: | |
if x % pri == 0: | |
return False | |
pri = pri + height | |
height = 6 - height | |
return True | |
def sum_prime(x): | |
if x < 0: | |
x = -x | |
if x < 2: | |
return 0 | |
result = 0 | |
if x >= 2: | |
result = 2 | |
for s in range(3,x+1,2): | |
if is_prime(s): | |
result = result + s | |
return result | |
if __name__ == "__main__": | |
import sys | |
print(sum_prime(int(sys.argv[1]))) | |
#=> 142913828922 | |
#=> time: 8.70s ( with corei7, mem 16G) |
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他の人のを見てて気づいたけど、こういうので引数として、問題に与えた数を処理するのは良くないのかー。ミスった。