void helper(string& s, vector<string>& ret, vector<string>& config, int begin)
{
if (config.size() == 4){
if(begin == s.size())
{
string Address = vectorToAddress(config);
ret.push_back(Address);
}
return;
}
for (int i = begin; i < s.length() && i < begin + 3; i++)
{
string num = s.substr(begin, i-begin+1);
if (isValidNum(num))
{
config.push_back(num);
helper(s, ret, config, i+1);
config.pop_back();
}
}
}
bool isValidListing(const std::string & s) {
auto it = s.begin();
while (isalpha(*it) && isupper(*it)) { ++it; }
if (!isValidDept(std::string(s.begin(), it))) { return false; }
return isValidNum(std::stoi(std::string(it, s.end())));
}
