ducss2015

#include <my_epi/common.h>
#include <sstream>
#include <fstream>
#include <map>

struct MemoryUsage {
  long start_time, end_time;
  int memory_usage;
};

ducss2015

void PrintCombination(const std::string& str, const std::vector<size_t>& combination) {
  for (size_t i = 0; i < combination.size(); ++i) {
    std::cout << str[combination[i]];
  }
  std::cout << std::endl;
}

void PrintCombinationFixedLength(const std::string& str, size_t combination_length) {
  std::vector<size_t> combination;
  size_t string_length = str.length();