30 lines
486 B
Perl
30 lines
486 B
Perl
use 5.20.0;
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use experimental 'postderef';
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use List::UtilsBy qw/ max_by/;
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my @stacks = split ' ', <>;
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my %seen;
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until( $seen{ join ':', @stacks }++ ) {
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redistribute();
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}
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my $target = join ":", @stacks;
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my $i = 0;
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redistribute($i++) until $i and $target eq join ':', @stacks;
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say $i;
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sub redistribute {
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warn "@stacks\n";
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my $col = max_by { $stacks[$_] } 0..$#stacks;
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my $v = $stacks[$col];
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$stacks[$col] = 0;
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$stacks[ ++$col % @stacks ]++ while $v--;
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}
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