Order by pair comparisons: Difference between revisions
→{{header|Raku}}: Added Raku solution
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red orange yellow green blue indigo violet</pre>
=={{header|Raku}}==
Raku's sort (like most languages) can take a custom "comparator" routine.
Since the calls to the comparator are minimized, and the info that the user provides is analogous to the required return values of the comparator, we just need to embed the prompt directly in the comparator.
<lang perl6>my $ask_count = 0;
sub by_asking ( $a, $b ) {
$ask_count++;
constant $fmt = '%2d. Is %-6s [ less than | greater than | equal to ] %-6s? ( < = > ) ';
constant %o = '<' => Order::Less,
'=' => Order::Same,
'>' => Order::More;
loop {
my $input = prompt sprintf $fmt, $ask_count, $a, $b;
return $_ with %o{ $input.trim };
say "Invalid input '$input'";
}
}
my @colors = <violet red green indigo blue yellow orange>;
my @sorted = @colors.sort: &by_asking;
say (:@sorted);
die if @sorted».substr(0,1).join ne 'roygbiv';
my $expected_ask_count = @colors.elems * log(@colors.elems);
warn "Too many questions? ({:$ask_count} > {:$expected_ask_count})" if $ask_count > $expected_ask_count;</lang>
{{out}}
<pre>
1. Is violet [ less than | greater than | equal to ] red ? ( < = > ) >
2. Is green [ less than | greater than | equal to ] indigo? ( < = > ) <
3. Is blue [ less than | greater than | equal to ] yellow? ( < = > ) >
4. Is red [ less than | greater than | equal to ] green ? ( < = > ) <
5. Is violet [ less than | greater than | equal to ] green ? ( < = > ) >
6. Is violet [ less than | greater than | equal to ] indigo? ( < = > ) >
7. Is yellow [ less than | greater than | equal to ] orange? ( < = > ) >
8. Is red [ less than | greater than | equal to ] orange? ( < = > ) <
9. Is green [ less than | greater than | equal to ] orange? ( < = > ) >
10. Is green [ less than | greater than | equal to ] yellow? ( < = > ) >
11. Is green [ less than | greater than | equal to ] blue ? ( < = > ) <
12. Is indigo [ less than | greater than | equal to ] blue ? ( < = > ) >
sorted => [red orange yellow green blue indigo violet]
</pre>
=={{header|Wren}}==
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