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本帖最后由 jerryxjr1220 于 2016-10-16 09:48 编辑
由于计算Project Euler时经常会用到一些常用的函数,特此汇总一下,方便以后调用。
- # 生成质数列表
- def getPrime(n):
- primes = [True]*n
- primes[0], primes[1] = False, False
- for (i, prime) in enumerate(primes):
- if prime:
- for j in range(i*i,n,i):
- primes[j] = False
- primelist = []
- for (k, trueprime) in enumerate(primes):
- if trueprime:
- primelist.append(k)
- return primelist
- # 生成欧拉函数列表
- def philist(n):
- primelist = getPrime(n)
- PHI = [0]*(n+1)
- PHI[0], PHI[1] = -1, 1
- for eachprime in primelist:
- PHI[eachprime] = eachprime - 1
- for i in range(len(primelist)):
- p = primelist[i]
- for k in range(p*p,n+1,p):
- PHI[k] = PHI[int(k/p)]*(p-1)
- for j in range(p*p,n+1,p*p):
- PHI[j] = PHI[int(j/p)]*p
- return PHI
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