53 lines
774 B
Perl
53 lines
774 B
Perl
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use 5.20.0;
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my @commands = <>;
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my $i = 0;
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my %reg;
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my $last_played;
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use experimental qw/ signatures /;
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sub valof($x) {
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$x =~ /\d/ ? $x : $reg{$x};
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}
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my $vr = qr/(-?\d+|.)/;
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my $times;
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use DDP;
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my $t;
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while() {
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last if $i < 0 or $i > $#commands;
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$_ = $commands[$i++];
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# say $_;
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if( /set (.) $vr/ ) {
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$reg{$1} = valof($2);
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}
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elsif( /sub (.) $vr/ ) {
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$reg{$1} -= valof($2);
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}
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elsif( /mul (.) $vr/ ) {
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$reg{$1} *= valof($2);
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$times++;
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die if $times > 10_000;
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# say $times;
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}
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elsif( /jnz (.) $vr/ ) {
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$i += -1 + valof($2) if valof($1) != 0;
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}
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else { die "wut? $_"; }
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# say $_;
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# p %reg ;#unless $t++ % 10_000;
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# my $dummy = <STDIN>;
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}
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say $times;
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