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54 lines
1.4 KiB
54 lines
1.4 KiB
#!/usr/bin/env perl
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use strict;
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use warnings;
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use 5.10.0;
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# NOTE: we got the thing about the goat being the prize backwards
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# from how this is usually defined.
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# basic setup:
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# you get 3 doors
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# - initially, you pick a door at random
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# - second, the host eliminates one of the two remaining doors that you haven't picked
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# - now, you have the option to switch to the remaining door from the one you've already picked
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my ($switched, $unswitched) = (0, 0);
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my $doors = 3;
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for (my $i = 0; $i < 1000000; $i++) {
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my $goat = int(rand($doors));
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my $initial_selection = int(rand($doors));
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# my $host_eliminates = int(rand($doors));
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# until (($host_eliminates != $initial_selection) && ($host_eliminates != $goat)) {
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# $host_eliminates = int(rand($doors));
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# }
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# THIS IS OUR BUG (i kind of think)
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# my $final_selection = int(rand($doors));
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# until ($final_selection != $host_eliminates) {
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# $final_selection = int(rand($doors));
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# }
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if ($goat == $initial_selection) {
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$unswitched++;
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} else {
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$switched++;
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}
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# say "you pick: $initial_selection"; say "host eliminates: $host_eliminates";
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# say "goat is: $goat";
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# say "final selection is: $final_selection";
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# say "correct? " . ($result ? 'yes' : 'no');
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if ($i % 10000 == 0) {
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say "$switched, $unswitched ";
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}
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}
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say "switched from initial decision: $switched";
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say "unswitched from initial decision: $unswitched";
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