leetcodePython/14. Longest Common Prefix.py at master · zhibolau/leetcodePython · GitHub

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class Solution(object):
    def longestCommonPrefix(self, strs):
        """
        :type strs: List[str]
        :rtype: str
        """

        if not str:
            return ""

        for i in range(len(strs[0])):
            for string in strs[1:]:
                if i >= len(string) or string[i] != strs[0][i]:
                    return strs[0][:i]
        return strs[0]


#法2

class Solution(object):
    def longestCommonPrefix(self, strs):
        """
        :type strs: List[str]
        :rtype: str
        """

        result =""

        i = 0

        while True:
            try:
                sets = set(string[i] for string in strs)
                if len(sets) ==1:
                    result += sets.pop()
                    i += 1
                else:
                    break
            except:
                break

        return result