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| import 'dart:math'; | |
| bool oneRun({bool stickToInitialChoice=true}) { | |
| var doors = [false, false, false]; | |
| var winDoor = Random().nextInt(3); | |
| doors[winDoor] = true; | |
| // Player selected this door at the start of the game | |
| var initialChoice = Random().nextInt(3); | |
| // Game master will open a loser door, but not the one from the player | |
| var openDoor = initialChoice; | |
| while (openDoor == initialChoice) { | |
| openDoor = Random().nextInt(3); | |
| // Check if the door to open is a winner. If yes, pick another door. | |
| if (doors[openDoor]) { | |
| openDoor = initialChoice; | |
| } | |
| } | |
| if (stickToInitialChoice) { | |
| return doors[initialChoice]; | |
| } else { | |
| if (initialChoice==0 && openDoor==1 || initialChoice==1 && openDoor==0) { | |
| return doors[2]; | |
| } | |
| if (initialChoice==0 && openDoor==2 || initialChoice==2 && openDoor==0) { | |
| return doors[1]; | |
| } | |
| // if (initialChoice==1 && openDoor==2 || initialChoice==2 && openDoor==1) | |
| return doors[0]; | |
| } | |
| } | |
| class Result { | |
| var win=0; | |
| var lose=0; | |
| } | |
| Result runMany(int loops, {bool stickToInitialChoice=true}) { | |
| var res=Result(); | |
| for (var i=0; i<loops; ++i) { | |
| if (oneRun(stickToInitialChoice: stickToInitialChoice)) { | |
| ++res.win; | |
| } else { | |
| ++res.lose; | |
| } | |
| } | |
| return res; | |
| } | |
| void main() { | |
| var result; | |
| result=runMany(10000, stickToInitialChoice: true); | |
| print("No Switch: win ${result.win}, lose ${result.lose}"); | |
| result=runMany(10000, stickToInitialChoice: false); | |
| print("Always Switch: win ${result.win}, lose ${result.lose}"); | |
| } |
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