[leetcode]14. Longest Common Prefix

方法有点蠢，没想好怎么不用循环取所有元素的前index位，就顺手这么写了。

Success

Details 

Runtime: 32 ms, faster than 99.37% of Python3 online submissions forLongest Common Prefix.

Memory Usage: 13.2 MB, less than 36.85% of Python3 online submissions for Longest Common Prefix.

 

Submission Detail

118 / 118 test cases passed.	Status:  Accepted
Runtime: 32 ms Memory Usage: 13.2 MB	Submitted: 2 minutes ago

class Solution:
    def longestCommonPrefix(self, strs: List[str]) -> str:
        times = 0
        for index in range(len(strs)):
            if len(strs[index]) > times:
                times = len(strs[index])
        #circle for (times) times
        ret =''
        for index in range(times):
            isequal = True
            temp = strs[0][:index+1]
            for i in range(1,len(strs)):
                if temp == strs[i][:index+1]:
                    pass
                else:
                    isequal = False
                    break
            if isequal:
                ret = temp
            else:
                break
        return ret

国际惯例抄一个：

class Solution:
    def longestCommonPrefix(self, strs: List[str]) -> str:
        if '' in strs or not strs:  return ''
        index = 0
        for i, item in enumerate(zip(*strs)):
            if len(set(item)) != 1:
                return strs[0][:i]
            else:  index = i
        return strs[0][:index + 1]