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  1. /* original code written by CyberPunk666 @ipon */
  2.  
  3. #include <iostream>
  4. #include <stdio.h>
  5.  
  6. #include <cstdlib>
  7. #include <ctime>
  8.  
  9. using namespace std;
  10.  
  11. const int N = 1000000;
  12.  
  13.  
  14. int main()
  15. {
  16. 	bool doors[3];
  17.  
  18. 	int count_switch = 0;
  19. 	int count_switch_WIN = 0;
  20.  
  21. 	int count_NOswitch = 0;
  22. 	int count_NOswitch_WIN = 0;
  23.  
  24. 	srand(time(0));
  25.  
  26.  
  27. 	for (int i = 0; i < N; ++i)
  28. 	{
  29. 		for (int j = 0; j < 3; doors[j++] = false);
  30. 		doors[rand() % 3] = true;
  31.  
  32. 		int myDoor = rand() % 3;
  33.  
  34. 		int firstOpen;
  35. 		do
  36. 		{
  37. 			firstOpen = rand() % 3;
  38. 		} while (firstOpen == myDoor /*|| doors[firstOpen] == true*/);
  39.  
  40.         /*mod starts*/
  41.         if (doors[firstOpen] == true) continue;
  42.         /*mod ends*/
  43.  
  44. 		int switchDoor = rand() % 2;
  45.  
  46. 		if (switchDoor == 1)
  47. 		{
  48. 			for (int j = 0; j < 3; ++j)
  49. 			{
  50. 				if (j != myDoor && j != firstOpen)
  51. 				{
  52. 					myDoor = j;
  53. 					break;
  54. 				}
  55. 			}
  56. 		}
  57.  
  58. 		if (switchDoor == 1)
  59. 		{
  60. 			++count_switch;
  61. 			if (doors[myDoor] == true) ++count_switch_WIN;
  62. 		}
  63. 		if (switchDoor == 0)
  64. 		{
  65. 			++count_NOswitch;
  66. 			if (doors[myDoor] == true) ++count_NOswitch_WIN;
  67. 		}
  68. 	}
  69.  
  70. 	double winrate = (double)count_switch_WIN / count_switch * 100;
  71. 	double winrateNO = (double)count_NOswitch_WIN / count_NOswitch * 100;
  72.  
  73. 	printf("Switch_WINRATE:   %f% (%d game)\nNOSwitch_WINRATE: %f% (%d game)\n", winrate, count_switch, winrateNO, count_NOswitch);
  74.  
  75.  
  76. 	return 0;
  77. }
  78.  
Success #stdin #stdout 0.12s 3140KB
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stdin
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Standard input is empty
stdout
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Switch_WINRATE:   49.972533% (333133 game)
NOSwitch_WINRATE: 49.957054% (334139 game)
https://ideone.com/ebNRFv
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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