Qustion

Write a function to find the longest common prefix string amongst an array of strings.

If there is no common prefix, return an empty string "".

• Example 1:

Input: ["flower","flow","flight"]
Output: "fl"

• Example 2:

Input: ["dog","racecar","car"]
Output: ""
Explanation: There is no common prefix among the input strings.

Note:

All given inputs are in lowercase letters a-z.

class Solution:
    def longestCommonPrefix(self, strs):
        """
        :type strs: List[str]
        :rtype: str
        """
        if not strs: 
            return '' 
        comm = '' 
        for i in range(len(strs[0])): 
            for j in range(1, len(strs)): 
                if i >= len(strs[j]) or strs[j][i] != strs[0][i]: 
                    return comm
            comm += strs[0][i] 
        return comm