class Solution:
def numUniqueEmails(self, emails: 'List[str]') -> 'int':
accept = []
for email in emails:
local = email.split('@')[0]
domain = email.split('@')[1]
if '+' in local:
local = local.split('+')[0]
if '.' in local:
local = local.replace('.','')
result = local+domain
if result not in accept:
accept.append(result)
return len(accept)
其中：速度76ms，内存12.7M
优化一：使用set直接去重复，使用''.join()进行字符拼接
class Solution:
def numUniqueEmails(self, emails: 'List[str]') -> 'int':
accept = set()
for email in emails:
local,domain = email.split('@')
local = ''.join(local.split('+')[0].split('.'))
result = local + '@' +domain
accept.add(result)
return len(accept)
速度：48ms，内存12.6M
优化二：使用map映射的方式，不用手动申请内存，可能map函数自动申请了内存，所以内存没有降下来。
class Solution:
def numUniqueEmails(self, emails: 'List[str]') -> 'int':
def processone(email):
i = email.find('@')
j = email.find('+')
if j < i and j>0:
return ''.join(email[:j].split('.')) + email[i:]
elif j == 0:
return email[i:]
else:
return ''.join(email[:i].split('.')) + email[i:]
return len(set(map(processone,emails)))
速度：44ms,内存12.5M