76 lines
1.7 KiB
Perl
76 lines
1.7 KiB
Perl
#!perl
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use strict;
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use warnings qw(FATAL all);
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my $n = shift(@ARGV) || 4;
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if( $n < 2 or $n > 26 ) {
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die "You can't play a size $n game\n";
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}
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my $n2 = $n*$n;
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my (@rows, @cols);
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for my $i ( 0 .. $n-1 ) {
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my $row = my $col = "\x00" x $n2;
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vec($row, $i * $n + $_, 8) ^= 1 for 0 .. $n-1;
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vec($col, $i + $_ * $n, 8) ^= 1 for 0 .. $n-1;
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push @rows, $row;
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push @cols, $col;
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}
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my $goal = "0" x $n2;
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int(rand(2)) or (vec($goal, $_, 8) ^= 1) for 0 .. $n2-1;
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my $start = $goal;
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{
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for(@rows, @cols) {
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$start ^= $_ if int rand 2;
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}
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redo if $start eq $goal;
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}
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my @letters = ('a'..'z')[0..$n-1];
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sub to_strings {
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my $board = shift;
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my @result = join(" ", " ", @letters);
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for( 0 .. $n-1 ) {
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my $res = sprintf("%2d ",$_+1);
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$res .= join " ", split //, substr $board, $_*$n, $n;
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push @result, $res;
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}
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\@result;
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}
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my $fmt;
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my ($stext, $etext) = ("Starting board", "Ending board");
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my $re = join "|", reverse 1 .. $n, @letters;
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my $moves_so_far = 0;
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while( 1 ) {
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my ($from, $to) = (to_strings($start), to_strings($goal));
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unless( $fmt ) {
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my $len = length $from->[0];
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$len = length($stext) if $len < length $stext;
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$fmt = join($len, "%", "s%", "s\n");
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}
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printf $fmt, $stext, $etext;
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printf $fmt, $from->[$_], $to->[$_] for 0 .. $n;
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last if $start eq $goal;
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INPUT_LOOP: {
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printf "Move #%s: Type one or more row numbers and/or column letters: ",
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$moves_so_far+1;
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my $input = <>;
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die unless defined $input;
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my $did_one;
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for( $input =~ /($re)/gi ) {
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$did_one = 1;
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if( /\d/ ) {
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$start ^= $rows[$_-1];
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} else {
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$_ = ord(lc) - ord('a');
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$start ^= $cols[$_];
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}
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++$moves_so_far;
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}
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redo INPUT_LOOP unless $did_one;
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}
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}
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print "You won after $moves_so_far moves.\n";
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