int Solution::compareVersion(string version1, string version2) {
int v1=version1.size(),v2=version2.size();
int i=0,j=0;
while(i<v1 or j<v2)
{
string x="",y="";
bool ck1=0,ck2=0;
while(i<v1 and version1[i]!='.'){
if(ck1==0 and version1[i]=='0'){
i++;continue;
}
ck1=1;
x+=version1[i];
i++;
}
if(i!=v1)i++;
while(j<v2 and version2[j]!='.'){
if(ck2==0 and version2[j]=='0'){
j++;continue;
}
y+=version2[j];
ck2=1;
j++;
}
if(j!=v2)j++;
if(x.empty())x+='0';
if(y.empty())y+='0';
if(x.size()>y.size())return 1;
if(x.size()<y.size())return -1;
if(x>y)return 1;
if(x<y)return -1;
}
return 0;
}
