Longest Common Prefix

最新推荐文章于 2020-07-03 09:58:21 发布

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最新推荐文章于 2020-07-03 09:58:21 发布

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本文介绍了一种在字符串数组中查找最长公共前缀的方法，并提供了两种Python实现方案。第一种方法通过比较每个字符串的字符来确定公共前缀，而第二种方法则利用了zip函数和set的特性来简化代码。

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题目链接

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.

python代码实现

class Solution:
    def longestCommonPrefix(self, strs):
        """
        :type strs: List[str]
        :rtype: str
        """
        if len(strs) == 0:
            return ''
        if len(strs) == 1:
            return strs[0]
        first = strs[0]
        count = 0
        # print(min(strs, key=lambda x: len(x)))
        for index in range(0, len(min(strs, key=lambda x: len(x)))):
            for j in range(1, len(strs)):
                # try:
                temp = strs[j][index]
                # except IndexError:
                #     temp = ''
                if temp == first[count]:
                    if j + 1 == len(strs):
                        count += 1
                else:
                    return first[:count]
        return first[:count]


        # **************************************************

python第二种方式：

class Solution:
    def longestCommonPrefix(self, strs):
        # 第二种方式
        if not strs:
            return ""
        print(list(zip("flower", "flow", "flight")))
        print(list(zip(*strs)))
        for i, words in enumerate(zip(*strs)):
            if len(set(words)) > 1:
                return strs[0][:i]
        else:
            return min(strs)
s = Solution()
# res = s.longestCommonPrefix(["c", "acc", "ccc"])
res = s.longestCommonPrefix(["flower", "flow", "flight"])
print(res)