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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6. import java.util.Random;
  7. import java.util.stream.Stream;
  8.  
  9.  
  10. /* Name of the class has to be "Main" only if the class is public. */
  11. class Ideone
  12. {
  13. 	public static void main (String[] args) throws java.lang.Exception
  14. 	{
  15. 		final int count = 10_000_000;
  16.         final int doorsCount = 3;
  17.         boolean changeDoor = true;
  18.         int wins = 0;
  19.         Random random = new Random();
  20.  
  21.         for (int i = 0; i < count; i++) {
  22.             int[] doors = new int[doorsCount];
  23.             int winingDoor = random.nextInt(doorsCount);
  24.             doors[winingDoor] = 1;
  25.  
  26.             int selectedDoor = random.nextInt(doorsCount);
  27.             Integer closedDoor = Stream.of(0, 1, 2).filter(door -> door != winingDoor && door != selectedDoor)
  28.                     .findAny()
  29.                     .get();
  30.  
  31.             if (changeDoor) {
  32.                 int newDoorNumber = 3 - closedDoor - selectedDoor;
  33.                 if (newDoorNumber == winingDoor) {
  34.                     wins++;
  35.                 }
  36.             } else {
  37.                 if (selectedDoor == winingDoor) {
  38.                     wins++;
  39.                 }
  40.             }
  41.  
  42.         }
  43.         System.out.printf("Doors: %s, wins: %s, percent %s", count, wins, (double) wins / count);
  44. 	}
  45. }
Success #stdin #stdout 0.87s 122180KB
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Standard input is empty
stdout
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Doors: 10000000, wins: 6668270, percent 0.666827
https://ideone.com/RFa9VQ
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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