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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. /* Name of the class has to be "Main" only if the class is public. */
  10. class Ideone
  11. {
  12. 	public static void main (String[] args) throws java.lang.Exception
  13. 	{
  14. 		final int count = 10_000_000;
  15.         final int doorsCount = 3;
  16.         boolean changeDoor = true;
  17.         int wins = 0;
  18.         Random random = new Random();
  19.  
  20.         for (int i = 0; i < count; i++) {
  21.             int winingDoor = random.nextInt(doorsCount);
  22.  
  23.             int selectedDoor = random.nextInt(doorsCount);
  24.             Integer closedDoor = Stream.of(0, 1, 2).filter(door -> door != winingDoor && door != selectedDoor)
  25.                     .findAny()
  26.                     .get();
  27.  
  28.             if (random.nextBoolean()) {
  29.                 int newDoorNumber = 3 - closedDoor - selectedDoor;
  30.                 if (newDoorNumber == winingDoor) {
  31.                     wins++;
  32.                 }
  33.             } else {
  34.                 if (selectedDoor == winingDoor) {
  35.                     wins++;
  36.                 }
  37.             }
  38.  
  39.         }
  40.         System.out.printf("Doors: %s, wins: %s, percent %s", count, wins, (double) wins / count);
  41. 	}
  42. }
Success #stdin #stdout 1.17s 120784KB
comments (?)
stdin 
Standard input is empty
stdout 
Doors: 10000000, wins: 4997248, percent 0.4997248
https://ideone.com/H3xI2v
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
public

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