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  1. #include <random>
  2. #include <array>
  3. #include <iostream>
  4.  
  5. int RollADice1(const std::array<int, 6>& chances) {
  6. 	static std::random_device rd;  //Will be used to obtain a seed for the random number engine
  7. 	static std::mt19937 gen(rd()); //Standard mersenne_twister_engine seeded with rd()
  8. 	static std::uniform_int_distribution<int> distrib(0, *chances.crbegin());
  9.  
  10. 	auto roll = distrib(gen);
  11.  
  12. 	for(int i=0; i < chances.size(); ++i) {
  13. 		if (roll <= chances[i]) {
  14.             return i;
  15.         }
  16. 	}
  17.     return chances.size() - 1;
  18. }
  19.  
  20. int main() {
  21. 	constexpr std::array<int, 6> chances {
  22. 		100,
  23. 		100,
  24. 		200,
  25. 		100,
  26. 		100,
  27. 		600
  28. 	};
  29.  
  30.     std::array<int, 6> partial_sums{};
  31.     int prev{};
  32.     for(int i=0; i < partial_sums.size(); ++i) {
  33.         partial_sums[i] = chances[i] + prev;
  34.         prev = partial_sums[i];
  35.     }
  36.  
  37. 	std::array<int, 6> arr{};
  38.  
  39. 	for(int i=0; i < 120'000; ++i) {
  40. 		++arr.at(RollADice1(partial_sums));
  41. 	}
  42.  
  43. 	for(int i=0; i < arr.size(); ++i) {
  44. 		std::cout << i << ' ' << arr[i] << '\n';
  45. 	}
  46.  
  47.     std::cout << "Sum: " << std::accumulate(arr.begin(), arr.end(), 0) << '\n';
  48. }
Success #stdin #stdout 0.01s 5440KB
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stdin
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Standard input is empty
stdout
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0 10147
1 9907
2 19975
3 10118
4 10103
5 59750
Sum: 120000
https://ideone.com/AWbOY3
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
secret

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