造轮子-分割字符串

Leetcode-165
如题，这种题目首先要做的肯定是按'.'分割字符串。下面是我总结的两种分割字符串的方法。
首先，使用istringstream和getline进行分割：

string version1 = "1.0.0.1";vector<int> v1;istringstream s1(version1);string temp;while(getline(s1,temp,'.')){    v1.push_back(stoi(temp));}

其次，还有一个傻瓜办法：

string version1 = "1.0.0.1";vector<int> v1;string temp;for(int i = 0;i<version1.size();++i){    if(version1[i] != '.')        temp += version[i];    else{        v1.push_back(stoi(temp));        temp.clear();        }}if(temp != "") v1.push_back(stoi(temp));

下面附上该题的方法：

class Solution {public:    int compareVersion(string version1, string version2) {                vector<int> v1,v2;        istringstream s1(version1);        istringstream s2(version2);        string temp;        while(getline(s1,temp,'.')){            v1.push_back(stoi(temp));        }        while(getline(s2,temp,'.')){            v2.push_back(stoi(temp));        }        while(v1.size()>v2.size()){            v2.push_back(0);        }        while(v1.size()<v2.size()){            v1.push_back(0);        }        for(int i = 0;i<v1.size();++i){            if(v1[i] > v2[i]){                return 1;            }            if(v1[i] < v2[i]){                return -1;            }        }        return 0;    }};