42 lines
763 B
Perl
42 lines
763 B
Perl
use 5.20.0;
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use List::AllUtils qw/ first_index indexes /;
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use experimental qw/ smartmatch /;
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my @d = 'a'..'p';
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my @moves = split ',', <>;
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my @round = ( "@d" );
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my $total = 1_000_000_000;
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while( $total-- ) {
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for ( @moves ) {
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if( /s(\d+)/ ) {
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splice @d, 0, 0, splice @d, -$1;
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}
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elsif( m#x(\d+)/(\d+)# ) {
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@d[$1,$2] = @d[$2,$1];
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}
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elsif( m#p(.)/(.)# ) {
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my @i= indexes { $_ ~~ [ $1, $2 ] } @d;
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@d[@i] = @d[reverse@i];
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}
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}
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if( "@d" ~~ @round ) {
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warn "@d";
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@round = splice @round, first_index { $_ eq "@d" } @round;
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last;
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}
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else {
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push @round, "@d";
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}
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}
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$total %= @round;
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say $round[$total] =~ s/ //gr;
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