SRM 290 Div2 500

SRM 290 Div2 500

class BrokenClock
{

  vector<string> split(const string &str, const string &delim){
    vector<string> res;
    size_t current = 0, found, delimlen = delim.size();
    while((found = str.find(delim, current)) != string::npos){
      res.push_back(string(str, current, found - current));
      current = found + delimlen;
    }
    res.push_back(string(str, current, str.size() - current));
    return res;
  }

  int atoi2(const string &str){
    //return strtol(str.c_str(), NULL, 0);
    //基数に0を指定すると、
    //09などの文字列が来た時に8進数と認識してしまいバグったので基数10に修正。
    //馬鹿だねぇ。
    return strtol(str.c_str(), NULL, 10);
  }

public:
  int fewestClicks(string clockTime, string currentTime)
  {
    vector<string> v1 = split(clockTime, ":");
    vector<string> v2 = split(currentTime, ":");
    int clockHour = atoi2(v1[0]);
    int clockMin = atoi2(v1[1]);
    int curHour = atoi2(v2[0]);
    int curMin = atoi2(v2[1]);

    int hdiff = curHour - clockHour;
    if(hdiff < 0) hdiff = curHour + (24 - clockHour);
    clockMin += hdiff;
    if(clockMin >= 60) clockMin -= 60;
    int mdiff = curMin - clockMin;
    if(mdiff < 0) mdiff = curMin + (60 - clockMin);

    return hdiff + mdiff;

  }
};