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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. enum things {
  6. 	Goat = 0,
  7. 	Car  = 1
  8. };
  9.  
  10. #define IGNORANT_MONTY 1
  11.  
  12. int rand(int max) {
  13. 	float RM = RAND_MAX;
  14. 	return rand() / RM * max;
  15. }
  16.  
  17. int main() {
  18. 	srand(time(0));
  19. 	int num = 10000;
  20.  
  21. 	int change = 0;
  22. 	int stay = 0;
  23. 	int discarded = 0;
  24.  
  25. 	while(stay + change < num) {
  26. 		things doors[3];	
  27. 		for(auto & t : doors) {
  28. 			t = Goat;
  29. 		}
  30. 		doors[rand(3)] = Car;
  31.  
  32. 		int you = rand(3);
  33. 		int monty;
  34.  
  35. 	#if IGNORANT_MONTY
  36. 		monty = (rand(2) + you + 1) % 3;
  37.  
  38. 		if(doors[monty] == Car)
  39. 			discarded++;
  40. 		else 
  41. 	#else
  42. 		for(int i = 0; i < 3; ++i) {
  43. 			if( you == i )
  44. 				continue;
  45. 			if( doors[i] == Goat )
  46. 				continue;
  47. 			monty = i;
  48. 		}
  49. 	#endif
  50.  
  51. 		if(doors[you] == Car)
  52. 			stay++;
  53. 		else if(doors[you] == Goat)
  54. 			change++;
  55. 	}
  56.  
  57. 	cout << "stay: " << stay << endl << "change: " << change << endl << "discarded: " << discarded << endl;
  58. }
Success #stdin #stdout 0s 3140KB
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stdin
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Standard input is empty
stdout
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stay: 5004
change: 4996
discarded: 4911
https://ideone.com/MVqfL4
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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