gen_rand_matrix.cpp

#include <algorithm>
#include <cstdint>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <set>
#include <sstream>
#include <string>
#include <utility>
#include <vector>

int main(int argv, char* argc[]) {
  if(argv < 3 || argv > 5) {
    std::cerr << "Expect at least 3 arguments at maximum 5 argument:" << std::endl;
    std::cerr << "  ./gen_rand_matrix.x <size> <density> <amount> (path) (seed)" << std::endl;
    exit(1);
  }

  uint64_t seed = 42;
  if(argv == 3) {
    seed = atoi(argc[2]);
  }
  std::srand(seed);

  uint64_t size = atoi(argc[1]);
  double p = std::stod(argc[2]);
  uint64_t amount = atoi(argc[3]);
  uint64_t m = size * size * p;
  std::string path;
  if(argv <= 3) 
    path = argc[4];
  else
    path = ".";

  for(uint64_t i = 0; i < amount; i++) {
    std::set< std::pair< int, int > > matrix;
    while(matrix.size() < m) {
      matrix.insert({std::rand() % size, std::rand() % size});
    }

    std::stringstream path_save;
    path_save << path;
    path_save << "/rand_matrix-" << argc[2] << "-" << i << "-txt";
    std::ofstream save_matrix(path_save.str());

    for(auto const &one : matrix)
      save_matrix << one.first << " " << one.second << "\n";
    save_matrix.close();
  }
}