Submission for https://www.hackerrank.com/challenges/chocolate-feast

chocolate_feast.cpp

#include <iostream>
#include <fstream>
#include <exception>
#include <vector>

int main(const int argc, const char** argv) {

  const int UNSET                        = -1;
  const int BEGINNING                    = 0;
  const std::string DELIMITER            = " ";
  const size_t NOT_FOUND                 = std::string::npos;

  int num_tests                          = UNSET;
  size_t pos                             = BEGINNING;
  std::vector< std::vector<int> > tests;

  std::string line;
  std::string token;

  for (std::string line; std::getline(std::cin, line);) {

    if (UNSET == num_tests) {
      num_tests = atoi(line.c_str());
      continue;
    }

    std::vector< int > test;

    // while it is delimited, parse it
    while ((pos = line.find(DELIMITER)) != NOT_FOUND) {
      token = line.substr(BEGINNING, pos);
      test.push_back(atoi(token.c_str()));
      line.erase(BEGINNING, pos + DELIMITER.length());
    }

    // the last token
    test.push_back(atoi(line.c_str()));
    if (test.size() != 3) {
      std::cout << "Invalid test" << std::endl;
      test.clear();
      continue;
    }

    int money                       = test[0];
    int price_per_chocolate         = test[1];
    int num_wrappers_per_free_piece = test[2];
    int num_chocolates              = 0;

    // Invalid
    if (money <= 0)
      continue;

    // Valid, but we're broke
    if ( (price_per_chocolate <= 0)    ||
         (price_per_chocolate > money) )
      continue;

    // Invalid
    if (num_wrappers_per_free_piece <= 0)
      continue;

    while (money >= price_per_chocolate) {
      money -= price_per_chocolate;
      num_chocolates++;
      if (num_chocolates % num_wrappers_per_free_piece == 0) {
        num_chocolates++;
      }
    }

    std::cout << num_chocolates << std::endl;
  }
  return 0;
}