// Experimental content: Test fstream vs stdio

#include <cassert>
#include <chrono>
#include <cstdio>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>

constexpr auto max_limit = 0x7fffffff;
auto limit = 0L;
auto filename = "normal_distribution.txt";

void stdio() {
  auto file = std::fopen(filename, "r");
  assert(file);
  auto read_count = 0L;
  for (unsigned long long l;
       read_count < limit && fscanf(file, "%lld ", &l) != EOF;)
    read_count++;
  fclose(file);
}

void fstream() {
  std::ifstream fin(filename);
  auto read_count = 0L;
  for (unsigned long long l; read_count < limit && !fin.eof(); fin >> l)
    read_count++;
  fin.close();
}

auto measure(const char *function_name, void (*test_function)()) {
  auto start = std::chrono::high_resolution_clock::now();
  test_function();
  auto end = std::chrono::high_resolution_clock ::now();
  auto duration = end - start;
  std::cout << "Function: " << std::fixed << std::setprecision(3)
            << function_name << " " << (double)duration.count() / 1000.0 << "ms"
            << std::endl;
  return duration.count();
}

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

  if (argc >= 2) {
    filename = argv[1];
  }
  if (argc >= 3) {
    limit = strtol(argv[2], nullptr, 10);
  }
  if (limit <= 0) {
    limit = max_limit;
  }
  auto s = measure("stdio", stdio);
  auto f = measure("fstream", fstream);
  std::cout << (s > f ? "stdio" : "fstream") << "win";
}