python leetcode 387. First Unique Character in a String

利用find函数能极大地减少运行时间

class Solution:def firstUniqChar(self, s):""":type s: str:rtype: int"""c='qwertyuiopasdfghjklzxcvbnm'res=2**31-1for n in c:index = s.find(n)if index ==-1:continueif s[index+1:].find(n)==-1:res=min(res,index)return res if res!=2**31-1 else -1

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