【LeetCode】165. Compare Version Numbers 解题报告（Python）

标签（空格分隔）： LeetCode

作者： 负雪明烛
id： fuxuemingzhu
个人博客： http://fuxuemingzhu.me/

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题目地址：https://leetcode.com/problems/compare-version-numbers/description/

题目描述：

Compare two version numbers version1 and version2.
If version1 > version2 return 1; if version1 < version2 return -1;otherwise return 0.

You may assume that the version strings are non-empty and contain only digits and the . character.
The . character does not represent a decimal point and is used to separate number sequences.
For instance, 2.5 is not “two and a half” or “half way to version three”, it is the fifth second-level revision of the second first-level revision.

Example 1:

Input: version1 = "0.1", version2 = "1.1"

Output: -1

Example 2:

Input: version1 = "1.0.1", version2 = "1"

Output: 1

Example 3:

Input: version1 = "7.5.2.4", version2 = "7.5.3"

Output: -1

题目大意

比较两个版本号的大小。

解题方法

版本是用.进行分割的，那么我们也只能通过用.进行分割来判定版本号的大小。把版本号进行分割，需要找出一个较长的版本号的长度，把较短的版本的后面用0进行补齐。恩，然后进行比较。

class Solution(object):

    def compareVersion(self, version1, version2):

        """

        :type version1: str

        :type version2: str

        :rtype: int

        """

        v1_split = version1.split('.')

        v2_split = version2.split('.')

        v1_len, v2_len = len(v1_split), len(v2_split)

        maxLen = max(v1_len, v2_len)

        for i in range(maxLen):

            temp1, temp2 = 0, 0

            if i < v1_len:

                temp1 = int(v1_split[i])

            if i < v2_len:

                temp2 = int(v2_split[i])

            if temp1 < temp2:

                return -1

            elif temp1 > temp2:

                return 1

        return 0

日期

2018 年 6 月 26 日 ———— 早睡早起