int compareVersion(string version1, string version2) {

int main1 = std::stoi(version1);

int main2 = std::stoi(version2);

if (main1 > main2) return 1;

if (main1 < main2) return -1;

int p1 = version1.find('.');

int p2 = version2.find('.');

if (p1 == -1 && p2 == -1) {

return 0;

} else {

string sub1 = p1 == -1 ? "0" : version1.substr(p1 + 1, version1.size() - p1);

string sub2 = p2 == -1 ? "0" : version2.substr(p2 + 1, version2.size() - p2);

return compareVersion(sub1, sub2);

}

return 0;

}