class Solution {

public:

int compareVersion(string version1, string version2) {

vector<int> v1=transform(version1);

vector<int> v2=transform(version2);

int i=0,j=0;

while(i<v1.size() || j<v2.size()){

if(i>=v1.size()) v1.push_back(0);

if(j>=v2.size()) v2.push_back(0);

if(v1[i]>v2[j]) return 1;

else if(v1[i]<v2[j]) return -1;

else {

i++;

j++;

}

}

return 0;

}

vector<int> transform(string str){

vector<int> res;

res.clear();

int result=0;

int i=0;

for(i;i<=str.size();++i){

if(str[i]=='.'||str[i]=='\0'){

res.push_back(result);

result=0;

}

else{

result=result*10+(str[i]-'0');

}

}

return res;

}

};