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LeetCode Compare Version Numbers

来源:程序员人生   发布时间:2015-05-06 08:43:47 阅读次数:2500次

1.题目


Compare two version numbers version1 and version2.
If version1 > version2 return 1, if version1 < version2 return ⑴, 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.

Here is an example of version numbers ordering:

0.1 < 1.1 < 1.2 < 13.37


2.解答


class Solution { public: vector<string> getAllVersionString(string version1){ vector<string> allVersion1; string oneVersion1; for(int i = 0; i < version1.size(); ++i){ if(version1[i] != '.'){ oneVersion1.push_back(version1[i]); }else{ allVersion1.push_back(oneVersion1); oneVersion1.clear(); } } allVersion1.push_back(oneVersion1); return allVersion1; } int compareVer(vector<string> allVersion1, vector<string> allVersion2){ for(int i = 0; i < allVersion1.size(); ++i){ if(i < allVersion2.size()){ if(atoi(allVersion1[i].c_str()) < atoi(allVersion2[i].c_str())){ return ⑴; }else if(atoi(allVersion1[i].c_str()) > atoi(allVersion2[i].c_str())){ return 1; } }else{ if(atoi(allVersion1[i].c_str()) > 0){ return 1; } } } return 0; } int compareVersion(string version1, string version2) { vector<string> allVersion1 = getAllVersionString(version1); vector<string> allVersion2 = getAllVersionString(version2); int result = 0; if(allVersion1.size() >= allVersion2.size()){ result = compareVer(allVersion1, allVersion2); }else if(allVersion2.size() > allVersion1.size()){ result = -compareVer(allVersion2, allVersion1); } return result; } };

C++中好像没有分割的函数的,感觉我也写麻烦了。


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