HackerRank>Algorithm>Warmup>timeConversion

timeConversion.cpp

#include <bits/stdc++.h>

using namespace std;

string *subTimeString(string s, string str_arr[], int &str_cnt) {
  str_cnt = 0;
  char *str_buff = new char[s.length()];
  strcpy(str_buff, s.c_str());

  char *tok = strtok(str_buff, ":");
  while (tok != nullptr) {
    str_arr[str_cnt++] = string(tok);
    tok = strtok(nullptr, ":");
  }

  return str_arr;
}

/*
 * Complete the timeConversion function below.
 */
string timeConversion(string s) {
    string str_arr[s.length()];
    int str_cnt;

    string sub1 = s.substr(0, s.length() - 2);
    string sub2 = s.substr(s.length() - 2, s.length() - 1);

    subTimeString(sub1, str_arr, str_cnt);

    string result = "";

    if (sub2.compare("PM") == 0) {
      std::string::size_type sz; // alias of size_t

      int i_dec = std::stoi(str_arr[0], &sz);

      if(i_dec != 12){
          i_dec += 12;
      }

      result.append(std::to_string(i_dec));
      result.append(":");
      result.append(str_arr[1]);
      result.append(":");
      result.append(str_arr[2]);
    } else {
      std::string::size_type sz; // alias of size_t
      if (int i_dec = std::stoi(str_arr[0], &sz) == 12) {
        result.append("00");
      } else {
        result.append(str_arr[0]);
      }

      result.append(":");
      result.append(str_arr[1]);
      result.append(":");
      result.append(str_arr[2]);
    }

    return result;
}

int main()
{
    ofstream fout(getenv("OUTPUT_PATH"));

    string s;
    getline(cin, s);

    string result = timeConversion(s);

    fout << result << "\n";

    fout.close();

    return 0;
}