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use strict;
use warnings;
...
find( \@diag, $n, $k, $threshold, 0, [], \@result );

print "@$_: ".sum(map{$MTX->[$_][$_]}@$_)."\n" for @result;

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push @$result, [ @$solution, $array->[$_][1] ] for grep { $array->[$_][0] > $threshold } $start..$n-1;