There are so many ways to shuffle it

THERE ARE SO MANY WAYS TO SHUFFLE IT TASMWTSI there are so many ways to shuffle it koichi taniguchi (@nipotan) tokyo, japan livedoor co.,ltd. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • commit log In a department of our company, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • commit log we each have the practice to report another colleague’s weekly activities with each other ... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • commit log at every Friday's regular meeting. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • commit log We each report what its own target did what in this week by checking the diffs out from the revision control system. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • This changes the inside of our complicated system which is changing continually to be comprehensible to us. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • And it's a good way to keep the quality of our entire source code. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • Although, we need to decide that "who will check who?" to do it every week. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • • We each do live coding to make a decision in some rules of each season. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . • … • We call it "Time to Shuffle" ... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . •… ww • You may think "Just Shuffle? So?" Don't underestimate our performances. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the story line . . . •… ww • Now I’m going to introduce you the masterpieces of our SHUFFLE. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 1 "no rules" This season is just to be familiar with doing live coding for us. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 1 "no rules" And there's NO highlights because it's boring. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" In the second season, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" rand() and similar function which is derived from rand() are prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -MTime::HiRes -le '@a=@b=qw(claire tracy mohinder hiro matt nathan peter sylar);$t=Time::HiRes::time*100000% $#b+1;for(0..$#a){print $a[$_].q{ => }.$b[($_+$t)%(scalar @b)]}' claire => hiro tracy => matt mohinder => nathan hiro => peter matt => sylar nathan => claire peter => tracy sylar => mohinder First, microseconds are multiplied by hundred thousand. Then the random digit was made from them. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -MTime::HiRes -le '@a=@b=qw(claire tracy mohinder hiro matt nathan peter sylar);$t=Time::HiRes::time*100000% $#b+1;for(0..$#a){print $a[$_].q{ => }.$b[($_+$t)%(scalar @b)]}' claire => hiro tracy => matt mohinder => nathan hiro => peter matt => sylar nathan => claire peter => tracy sylar => mohinder Probably all you guys come up with the same idea. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -MTime::HiRes -le '@a=@b=qw(claire tracy mohinder hiro matt nathan peter sylar);$t=Time::HiRes::time*100000% $#b+1;for(0..$#a){print $a[$_].q{ => }.$b[($_+$t)%(scalar @b)]}' claire => hiro tracy => matt mohinder => nathan hiro => peter matt => sylar nathan => claire peter => tracy sylar => mohinder Also, it just moved the elements of the array. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -e '@m=@r=qw(claire tracy mohinder hiro matt nathan peter sylar); sub r{hex(`md5sum /proc/stat|head -c8`)%@m} while(++$c<100||scalar grep {$m[$_] eq $r[$_]} (0..$#m)) {$a=&r;$b=&r; @r[$a,$b] = @r[$b,$a]} printf "%-8s => %-8s n", $m[$_], $r[$_] for (0..$#m);' claire => tracy tracy => peter mohinder => hiro hiro => sylar matt => mohinder nathan => claire peter => nathan sylar => matt Next, it has the original random function. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -e '@m=@r=qw(claire tracy mohinder hiro matt nathan peter sylar); sub r{hex(`md5sum /proc/stat|head -c8`)%@m} while(++$c<100||scalar grep {$m[$_] eq $r[$_]} (0..$#m)) {$a=&r;$b=&r; @r[$a,$b] = @r[$b,$a]} printf "%-8s => %-8s n", $m[$_], $r[$_] for (0..$#m);' claire => tracy tracy => peter mohinder => hiro hiro => sylar matt => mohinder nathan => claire peter => nathan sylar => matt It recognizes a part of the produced MD5 message digest of kernel/system statistics (/proc/stat) as hex string, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -e '@m=@r=qw(claire tracy mohinder hiro matt nathan peter sylar); sub r{hex(`md5sum /proc/stat|head -c8`)%@m} while(++$c<100||scalar grep {$m[$_] eq $r[$_]} (0..$#m)) {$a=&r;$b=&r; @r[$a,$b] = @r[$b,$a]} printf "%-8s => %-8s n", $m[$_], $r[$_] for (0..$#m);' claire => tracy tracy => peter mohinder => hiro hiro => sylar matt => mohinder nathan => claire peter => nathan sylar => matt and the corresponding value of it is divided by the number of arguments. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -e '@m=@r=qw(claire tracy mohinder hiro matt nathan peter sylar); sub r{hex(`md5sum /proc/stat|head -c8`)%@m} while(++$c<100||scalar grep {$m[$_] eq $r[$_]} (0..$#m)) {$a=&r;$b=&r; @r[$a,$b] = @r[$b,$a]} printf "%-8s => %-8s n", $m[$_], $r[$_] for (0..$#m);' claire => tracy tracy => peter mohinder => hiro hiro => sylar matt => mohinder nathan => claire peter => nathan sylar => matt Then it returns the remainder. It is a random integer. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 2 "rand prohibited" % perl -e '@m=@r=qw(claire tracy mohinder hiro matt nathan peter sylar); sub r{hex(`md5sum /proc/stat|head -c8`)%@m} while(++$c<100||scalar grep {$m[$_] eq $r[$_]} (0..$#m)) {$a=&r;$b=&r; @r[$a,$b] = @r[$b,$a]} printf "%-8s => %-8s n", $m[$_], $r[$_] for (0..$#m);' claire => tracy tracy => peter mohinder => hiro hiro => sylar matt => mohinder nathan => claire peter => nathan sylar => matt And it tries to shuffle each elements completely but it might be given up if it spins over hundred times. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" In the third season, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" We should increase all possible combinations more than number of members. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" That is, just moving the elements is prohibited. Instead, we can use rand() again from the season. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" We did it! YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" -module(shuffle). -export([main/1,comb/2]). main(A) -> All = comb(A,A), Set = lists:nth(random:uniform(length(All)), All), output(Set). output([]) -> true; output([{A,B}|T]) -> io:format("~w => ~w~n", [A,B]), output(T). comb([], _) -> [[]]; comb([H|T], B) -> [ [{H, X}|Rest] || X<-B--[H], Rest<-comb(T, B--[X]) ]. Erlang?! YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" % erl Erlang R14B (erts-5.8.1) [source] [rq:1] [async-threads:0] [hipe] [kernel- poll:false] Eshell V5.8.1 (abort with ^G) 1> c(shuffle). {ok,shuffle} 2> shuffle:main([claire,mohinder,hiro,matt,nathan,peter,sylar]). claire => mohinder mohinder => nathan hiro => matt matt => sylar nathan => claire peter => hiro sylar => peter true I'm not sure, but it maybe works correctly. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" % ruby -e 'a=b=%w(claire tracy mohinder hiro matt nathan peter sylar); b=b.sort_by{rand} until (0..a.size-1).all? {|i|a[i]!=b[i]};a.zip(b){|x,y| puts "%8s => %s" % [x,y]}' claire => nathan tracy => hiro mohinder => peter hiro => matt matt => mohinder nathan => sylar peter => claire sylar => tracy Ruby?! YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" % ruby -e 'a=b=%w(claire tracy mohinder hiro matt nathan peter sylar); b=b.sort_by{rand} until (0..a.size-1).all? {|i|a[i]!=b[i]};a.zip(b){|x,y| puts "%8s => %s" % [x,y]}' claire => nathan tracy => hiro mohinder => peter hiro => matt matt => mohinder nathan => sylar peter => claire sylar => tracy Excuse me. This is Yet Another Perl Conference, isn't it. Why don't you use Perl? YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" % ruby -e 'a=b=%w(claire tracy mohinder hiro matt nathan peter sylar); b=b.sort_by{rand} until (0..a.size-1).all? {|i|a[i]!=b[i]};a.zip(b){|x,y| puts "%8s => %s" % [x,y]}' claire => nathan tracy => hiro mohinder => peter hiro => matt matt => mohinder nathan => sylar peter => claire sylar => tracy By the way, is zip() cool, it isn’t? YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 3 "increase combinations possible" % perl6 -e 'for ("foo", "bar", "baz") Z ("qux", "quux", "corge") -> $a, $b { say "$a => $b" }' foo => qux bar => quux baz => corge We can use "Z" for zip() operator in perl6. But I’m not sure about perl6. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" This season is like a time trial. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" In addition, it was laid down the most strict rules so far. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • The rules of the season are... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref write a perl subroutine which gets an arrayref of member list as the parameter ... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref and returns an arrayref of target members. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • Increase all possible combinations more than number of members. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • Eliminate the pairs that include the target of someone is oneself. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • Possibly faster than ever before. For comparison, we try to benchmark ... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • 10,000 times shuffle of 10 members, 1,000 times shuffle of 1,000 members, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • and 10 times shuffle of 10,000 members. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • Then we evaluate the results comprehensively and assume which is the reigning champion. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • • Preparing some tricks ahead of time and playing it is prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • • • / Meet the any of following conditions, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" • • arrayref arrayref • • • • • / it gives "different results each time", "all possible combinations" and/or "even results". YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my $array = shift; my $array2; do { $array2 = [sort { rand(3)-1 } @$array]; } while (grep $$array[$_] eq $$array2[$_], (0..$#$array)); return $array2; } At first, this is the interim champion. It’s not so fast because it’s the reference implementation. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my $array = shift; my $n = $#$array; my @index = (0..$n); my $i; for (0..$n) { $i = int(rand($n)); redo if $_ == $index[$i] || $i == $index[$_]; ( $index[$_], $index[$i] ) = ( $index[$i], $index[$_] ); } return [ @$array[@index] ]; } This is the 2nd champion. It works more than 4 times faster than the former champion. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my @array = @{$_[0]}; my ($i, $r) = scalar @array; while(--$i) { $r = rand($i); @array[$i, $r] = @array[$r, $i]; } return @array; } This is the 4th champion. Incidentally, it’s very similar to Fisher-Yates shuffle. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my @array = @{$_[0]}; my ($i, $r) = scalar @array; while(--$i) { $r = rand($i); @array[$i, $r] = @array[$r, $i]; } return @array; } You can find out the technique like this in perldoc -q shuffle (in perlfaq4). YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my @magic = (); return _shuffle(@_); if ($is_odd){ BEGIN{ @sep = map{$_ + $MAGIC} @sep; my $MAGIC = 3; @magic = @{$MAGIC[($R / $half / my @MAGIC = ([1,2,0], [2,0,1]); $half) % 2]}; srand; } my $R=int rand(1000000); return [@$arg[@magic, sub _shuffle { $sep[6] .. $sep[7], my $arg = shift; $sep[4] .. $sep[5], my $n = scalar @$arg; $sep[2] .. $sep[3], my $is_odd = $n % 2; $sep[0] .. $sep[1] $n -= $MAGIC if $is_odd; ]]; my $half = $n / 2; } my $r_a = ($R / $half) % ($half); } my $r_b = ($R % $half); } $R++; my @sep = (0 => $r_a, $r_a+1 => $half - 1, $half => $half + $r_b, $half + $r_b + 1 => $n -1); This is the 5th champion. It doesn't shuffle accurately. It's so tricky. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my @magic = (); return _shuffle(@_); if ($is_odd){ BEGIN{ @sep = map{$_ + $MAGIC} @sep; my $MAGIC = 3; @magic = @{$MAGIC[($R / $half / my @MAGIC = ([1,2,0], [2,0,1]); $half) % 2]}; srand; } my $R=int rand(1000000); return [@$arg[@magic, sub _shuffle { $sep[6] .. $sep[7], my $arg = shift; $sep[4] .. $sep[5], my $n = scalar @$arg; $sep[2] .. $sep[3], my $is_odd = $n % 2; $sep[0] .. $sep[1] $n -= $MAGIC if $is_odd; ]]; my $half = $n / 2; } my $r_a = ($R / $half) % ($half); } my $r_b = ($R % $half); } $R++; my @sep = (0 => $r_a, $r_a+1 => $half - 1, $half => $half + $r_b, $half + $r_b + 1 => $n -1); It works about 30% faster than Fisher-Yates shuffle. But It doesn't work at all under a specific condition. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { my @magic = (); return _shuffle(@_); if ($is_odd){ BEGIN{ @sep = map{$_ + $MAGIC} @sep; my $MAGIC = 3; @magic = @{$MAGIC[($R / $half / my @MAGIC = ([1,2,0], [2,0,1]); $half) % 2]}; srand; } my $R=int rand(1000000); return [@$arg[@magic, sub _shuffle { $sep[6] .. $sep[7], my $arg = shift; $sep[4] .. $sep[5], my $n = scalar @$arg; $sep[2] .. $sep[3], my $is_odd = $n % 2; $sep[0] .. $sep[1] $n -= $MAGIC if $is_odd; ]]; my $half = $n / 2; } my $r_a = ($R / $half) % ($half); } my $r_b = ($R % $half); } $R++; my @sep = (0 => $r_a, $r_a+1 => $half - 1, $half => $half + $r_b, $half + $r_b + 1 => $n -1); If you want to read the code carefully, Please wait the publication of this slide. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { MODULE = Foo PACKAGE = Foo return [Foo::fisher_yates(@{$_[0]})]; void BEGIN { fisher_yates(...) my $use = sub { PROTOTYPE: @ eval qq{ use $_[0]; }; CODE: return $@ ? () : 1; UV i = items; }; while (--i) { push @INC, qw(Foo/blib/lib Foo/blib/arch); UV swap = (UV)(Drand01() * i); unless ($use->('Foo')) { SV *tmp = ST(swap); if (-d 'Foo') { ST(swap) = ST(i); system(qw/rm -frv Foo/) && die $Ê; ST(i) = tmp; } } system(qw/h2xs -A -n Foo/) && die $Ê; XSRETURN(items); chdir 'Foo' or die $!; XSUB open my $xs, '>', 'Foo.xs' or die $!; print $xs <<'XSUB'; close $xs; #include "EXTERN.h" (system($^X, 'Makefile.PL') || #include "perl.h" system('make')) && die $Ê; #include "XSUB.h" chdir '..' or die $!; #include "ppport.h" $use->('Foo') or die $@; print "-" x 50 . "n"; } }; } This is the 6th champion. A Fisher-Yates XS implementation is embedded in a subroutine forcibly. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" sub shuffle { MODULE = Foo PACKAGE = Foo return [Foo::fisher_yates(@{$_[0]})]; void BEGIN { fisher_yates(...) my $use = sub { PROTOTYPE: @ eval qq{ use $_[0]; }; CODE: return $@ ? () : 1; UV i = items; }; while (--i) { push @INC, qw(Foo/blib/lib Foo/blib/arch); UV swap = (UV)(Drand01() * i); unless ($use->('Foo')) { SV *tmp = ST(swap); if (-d 'Foo') { ST(swap) = ST(i); system(qw/rm -frv Foo/) && die $Ê; ST(i) = tmp; } } system(qw/h2xs -A -n Foo/) && die $Ê; XSRETURN(items); chdir 'Foo' or die $!; XSUB open my $xs, '>', 'Foo.xs' or die $!; print $xs <<'XSUB'; close $xs; #include "EXTERN.h" (system($^X, 'Makefile.PL') || #include "perl.h" system('make')) && die $Ê; #include "XSUB.h" chdir '..' or die $!; #include "ppport.h" $use->('Foo') or die $@; print "-" x 50 . "n"; } }; } It works about 2 times faster than the former champion. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story As a side story. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story Satoshi Ueda (gunyoki), all you saw him a little while ago, he is a former member of ours. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story 19:55:00 <gunyoki> CPU kernel module 19:56:38 <gunyoki> 0 He said on IRC ... YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story 19:55:00 <gunyoki> CPU kernel module 19:56:38 <gunyoki> 0 <gunyoki> I wrote a kernel module which can change the CPU expended time of the task structure. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story 19:55:00 <gunyoki> CPU kernel module 19:56:38 <gunyoki> 0 <gunyoki> It enable that the (not actual) time for any kind of calculation to be zero. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story #include <linux/kernel.h> static int proc_write(struct file *page, const char *buf, #include <linux/module.h> unsigned long len, void *data) #include <linux/sched.h> { #include <linux/proc_fs.h> char tmp[64]; #include <asm/uaccess.h> long utime; struct task_struct *process; #define PROC_NAME "driver/utime" if (copy_from_user(tmp, buf, len)) return -EFAULT; static int pid; utime = simple_strtol(tmp, NULL, 0); module_param(pid, int, 0666); process = find_task_by_pid(pid); if (!process) { static int proc_read(char *page, char **start, off_t printk("pid error: %dn", pid); offset, int count, int *eof, void *data) return -EFAULT; { } unsigned long outbyte; printk("utime: %ld -> %ldn", process->utime, struct task_struct *process; utime); if (offset > 0) { process->utime = utime; *eof = 1; return len; return 0; } } process = find_task_by_pid(pid); int init_module(void) if (!process) { { printk("pid error: %dn", pid); struct proc_dir_entry *entry; *eof = 1; entry = create_proc_entry(PROC_NAME, 0666, NULL); return 0; if (entry == 0) } return -EINVAL; outbyte = sprintf(page, "%ld", process->utime); entry->read_proc = proc_read; printk("proc_read len = %lun", outbyte); entry->write_proc = proc_write; *eof = 1; return 0; return outbyte; } } void cleanup_module(void) { remove_proc_entry(PROC_NAME, NULL); kernel_module } MODULE_LICENSE("GPL2"); YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story obj-m += foo.o KDIR := /lib/modules/$(shell uname -r)/build PWD := $(shell pwd) default: $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules clean: rm -f *.o *.ko *.mod.c makefile YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story sub shuffle { my $array = shift; our $pid; if ($pid == 0) { $pid = $$; open my $pid_file, '>/sys/module/foo/pid'; print $pid_file $pid; close $pid_file; } open my $utime_file, '+</proc/driver/utime'; my $utime = <$utime_file>; my $result = champion($array); print $utime_file $utime; close $utime_file; return $result; } perl YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story sub shuffle { my $array = shift; our $pid; if ($pid == 0) { $pid = $$; open my $pid_file, '>/sys/module/foo/pid'; print $pid_file $pid; close $pid_file; } open my $utime_file, '+</proc/driver/utime'; my $utime = <$utime_file>; my $result = champion($array); print $utime_file $utime; close $utime_file; return $result; } He doesn’t write any shuffle code. perl YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT season 4 "time trial" side story sub shuffle { my $array = shift; a t our $pid; if ($pid == 0) { h e $pid = $$; open my $pid_file, '>/sys/module/foo/pid'; c print $pid_file $pid; close $pid_file; l e b } open my $utime_file, '+</proc/driver/utime'; my $utime = <$utime_file>; iva my $result = champion($array); g print $utime_file $utime; r close $utime_file; return $result; } o fHe doesn’t write any shuffle code. u n perl YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" Finally, it’s the final season. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" This title comes from a SF novel, written by Yasutaka Tsutsui. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" Prohibited characters are increasing week by week. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e ' # XXX your shuffle code here. ' The basic format is a one-liner like above. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e 'chomp(@m=<>);@i=(0..$#m);$j=@m;while ($j--) {$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(0..$#m) {printf(qq{%s=>%s n},$m[$_],$m[$i[$_]])}' prohibits: At the start, there was no prohibited characters. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e 'chomp(@m=<>);@i=(0..$#m);$j=@m;while ($j--) {$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(0..$#m) {printf(qq{%s=>%s n},$m[$_],$m[$i[$_]])}' prohibits: Next, using "0", "s" and "t" were prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e 'chomp(@m=<>);@i=(()..$#m); $j=@m;while($j--) {$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(().. $#m) {warn $m[$_]." => ".$m[$i[$_]]."n"}' prohibits: 0 s t In the early stage, we couldn’t use printf(). warn() was used instead of it to output the result. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e 'chomp(@m=<>);@i=(()..$#m); $j=@m;while($j--) {$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(().. $#m) {warn $m[$_]." => ".$m[$i[$_]]."n"}' prohibits: 0 s t Next, using "h", "k", "q" and " (double quotation) were prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '@m=<>;@i=(1-1..$#m);$j=$#m;for(; $j;$j--){$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(()..$#m){warn $m [$_].''' => '''.$m[$i[$_]]}' prohibits: " 0 h k q s t We couldn’t use while(). And quotation operators made us painful. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '@m=<>;@i=(1-1..$#m);$j=$#m;for(; $j;$j--){$r=rand($j);@i[$j,$r]=@i[$r,$j]};for(()..$#m){warn $m [$_].''' => '''.$m[$i[$_]]}' prohibits: " 0 h k q s t Next, "y", "," and ";" were prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{@m=<> xor @i=(1-1..$#m) xor $j=@m} for(1..--$j){$r=rand($j) xor @i[$j--=>$r]=@i[$r=>$j]} for(()..$#m){warn $m[$_].''' => '''.$m[$i[$_]]}' prohibits: " , 0 ; h k q s t y We started to join each statements by "xor" operator. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{@m=<> xor @i=(1-1..$#m) xor $j=@m} for(1..--$j){$r=rand($j) xor @i[$j--=>$r]=@i[$r=>$j]} for(()..$#m){warn $m[$_].''' => '''.$m[$i[$_]]}' prohibits: " , 0 ; h k q s t y Next, "o" was prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{@m=<>} {@i=(1-1..$#m)} {$j=@m} {map {{$r=rand($j)}=>{@i[$j--=>$r]=@i[$r=>$j]}} (1..--$j)} map {warn $m[$_].''' => '''.$m[$i[$_]]} (()..$#m)' prohibits: " , 0 ; h k o q s t y xor was no longer available. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{@m=<>} {@i=(1-1..$#m)} {$j=@m} {map {{$r=rand($j)}=>{@i[$j--=>$r]=@i[$r=>$j]}} (1..--$j)} map {warn $m[$_].''' => '''.$m[$i[$_]]} (()..$#m)' prohibits: " , 0 ; h k o q s t y Next, "-" was prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x=eval("x2d1") } {@m=<>} {@i= (()..$#m)} {$j=@m} {map {{$r=rand($j)}=>{@i[$j=>$r]=@i[$r=> $j]} => $j+=$x} (1..($j+=$x))} map {warn $m[$_].''' => '''. $m[$i[$_]]} (()..$#m)' prohibits: " , - 0 ; h k o q s t y We needed to require some creative thinking to do -1. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x=eval("x2d1") } {@m=<>} {@i= (()..$#m)} {$j=@m} {map {{$r=rand($j)}=>{@i[$j=>$r]=@i[$r=> $j]} => $j+=$x} (1..($j+=$x))} map {warn $m[$_].''' => '''. $m[$i[$_]]} (()..$#m)' prohibits: " , - 0 ; h k o q s t y Next, "r" was prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x=eval("x2d1") } {@m=<>} {@i= (()..$#m)} {$j=@m} {$v=$$}{map {{$v *= $v}=> {$p = $v % $j}=> {@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {@d = map { $m[$_].''' => '''.$m[$i[$_]]} (()..$#m)} {die @d}' prohibits: " , - 0 ; h k o q r s t y We couldn’t use rand(). And also warn() was not available to output the result. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x=eval("x2d1") } {@m=<>} {@i= (()..$#m)} {$j=@m} {$v=$$}{map {{$v *= $v}=> {$p = $v % $j}=> {@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {@d = map { $m[$_].''' => '''.$m[$i[$_]]} (()..$#m)} {die @d}' prohibits: " , - 0 ; h k o q r s t y We considered that die() was the last way to output. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x=eval("x2d1") } {@m=<>} {@i= (()..$#m)} {$j=@m} {$v=$$}{map {{$v *= $v}=> {$p = $v % $j}=> {@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {@d = map { $m[$_].''' => '''.$m[$i[$_]]} (()..$#m)} {die @d}' prohibits: " , - 0 ; h k o q r s t y Next, "e" was prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$}{map {{$v = (45 * $v + 555) % (4 ** 5)}=> {$p = $v % $j}=>{@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {map { $d .= $m[$_].''' => '''.$m[$i [$_]]} (()..$#m)} &$d' prohibits: " , - 0 ; e h k o q r s t y We couldn’t eval(). We couldn’t die(). YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$}{map {{$v = (45 * $v + 555) % (4 ** 5)}=> {$p = $v % $j}=>{@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {map { $d .= $m[$_].''' => '''.$m[$i [$_]]} (()..$#m)} &$d' prohibits: " , - 0 ; e h k o q r s t y The output result was like; "Undefined subroutine &main::clair => hiro ... called at -e line 1, <> line 7." YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$}{map {{$v = (45 * $v + 555) % (4 ** 5)}=> {$p = $v % $j}=>{@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {map { $d .= $m[$_].''' => '''.$m[$i [$_]]} (()..$#m)} &$d' prohibits: " , - 0 ; e h k o q r s t y Also, we started to use Linear congruential generators (LCGs) to generate a random digit. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$}{map {{$v = (45 * $v + 555) % (4 ** 5)}=> {$p = $v % $j}=>{@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {map { $d .= $m[$_].''' => '''.$m[$i [$_]]} (()..$#m)} &$d' prohibits: " , - 0 ; e h k o q r s t y To tell you the truth, I’m not sure about it. Wikipedia it for ourselves. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$}{map {{$v = (45 * $v + 555) % (4 ** 5)}=> {$p = $v % $j}=>{@i[$j=>$p]=@i[$p=>$j]} => $j+=$x} (1..($j+=$x))} {map { $d .= $m[$_].''' => '''.$m[$i [$_]]} (()..$#m)} &$d' prohibits: " , - 0 ; e h k o q r s t y Next, "p" was prohibited. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$} {$zz='''z''' x ($j+= $x)} {$zz=~/z(??{({$v = (45 * $v + 555) % (4 ** 5)}=> {$z = $v % $j}=>{@i[$j=>$z]=@i[$z=>$j]} => $j+=$x) })/} {$zz='''z''' x @m}{$zz=~/z(??{( $d .= $m[$zzz].''' => '''.$m[$i[$zzz+ +]] ) })/ } &$d' prohibits: " , - 0 ; e h k o p q r s t y map() the last built-in function was gone. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''L1'''^'''a''' } {@m=<>} {@i=(()..$#m)} {$j=@m} {$v=$$} {$zz='''z''' x ($j+= $x)} {$zz=~/z(??{({$v = (45 * $v + 555) % (4 ** 5)}=> {$z = $v % $j}=>{@i[$j=>$z]=@i[$z=>$j]} => $j+=$x) })/} {$zz='''z''' x @m}{$zz=~/z(??{( $d .= $m[$zzz].''' => '''.$m[$i[$zzz+ +]] ) })/ } &$d' prohibits: " , - 0 ; e h k o p q r s t y On this ocation, prohibited "a", "b", "c", "d", "f", "g", "i", "j", "l", "m", "n", "u", "v", "w" and "z" (every alphabet except "x"). YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''%'''|'''('''.1 } {@xx=<>} {@xxx=(()..$#xx)} {$xxxx=@xx} {$xxxxx=$$} {$xxxxxx='''x''' x ($xxxx+=$x)} {$xxxxxx=~/x(??{({$xxxxx = (45 * $xxxxx + 555) % (4 ** 5)}=> {$xxxxxxx = $xxxxx % $xxxx} =>{@xxx[$xxxx=>$xxxxxxx]=@xxx[$xxxxxxx=>$xxxx]} => $xxxx+= $x) })/} {$xxxxxx='''x''' x @xx}{$xxxxxx=~/x(?? {( $xxxxxxxxx .= $xx[$xxxxxxxx].''' => '''.$xx[$xxx [$xxxxxxxx++]] ) })/ } &$xxxxxxxxx' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w y z Does anybody fix my J’ai perdu le do de ma clarinette? YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''%'''|'''('''.1 } {@xx=<>} {@xxx=(()..$#xx)} {$xxxx=@xx} {$xxxxx=$$} {$xxxxxx='''x''' x ($xxxx+=$x)} {$xxxxxx=~/x(??{({$xxxxx = (45 * $xxxxx + 555) % (4 ** 5)}=> {$xxxxxxx = $xxxxx % $xxxx} =>{@xxx[$xxxx=>$xxxxxxx]=@xxx[$xxxxxxx=>$xxxx]} => $xxxx+= $x) })/} {$xxxxxx='''x''' x @xx}{$xxxxxx=~/x(?? {( $xxxxxxxxx .= $xx[$xxxxxxxx].''' => '''.$xx[$xxx [$xxxxxxxx++]] ) })/ } &$xxxxxxxxx' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w y z And finally, YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $x='''%'''|'''('''.1 } {@xx=<>} {@xxx=(()..$#xx)} {$xxxx=@xx} {$xxxxx=$$} {$xxxxxx='''x''' x ($xxxx+=$x)} {$xxxxxx=~/x(??{({$xxxxx = (45 * $xxxxx + 555) % (4 ** 5)}=> {$xxxxxxx = $xxxxx % $xxxx} =>{@xxx[$xxxx=>$xxxxxxx]=@xxx[$xxxxxxx=>$xxxx]} => $xxxx+= $x) })/} {$xxxxxx='''x''' x @xx}{$xxxxxx=~/x(?? {( $xxxxxxxxx .= $xx[$xxxxxxxx].''' => '''.$xx[$xxx [$xxxxxxxx++]] ) })/ } &$xxxxxxxxx' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w y z We decided to prohibit the last best hope, "x". YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $_1='''%'''|'''('''.1 } {$/ =''''''} {$_2=<>} {$*=1} {@_3=()} {$_2=~/^(.+?)$(??{{$_3 [$#_3+1]=$1}{$#_3?$_4.='''_''':''''''}{'''^'''}})/} {@_6=(()..$#_3)} {$_7=$#_3} {$_5=$$} {$_4=~/_(??{({$_5 = (45 * $_5 + 555) % (4 ** 5)}=> {$_11 = $_5 % $_7}=>{@_6[$_7=>$_11] =@_6[$_11=>$_7]} => $_7+=$_1) })/} {$_4.='''_'''}{$_4=~/_(?? {( $_8 .= $_3[$_9].''' => '''.$_3[$_6[$_9++]].''' ''' ) })/ } &$_8' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w x y z This is the final form without using alphabet. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $_1='''%'''|'''('''.1 } {$/ =''''''} {$_2=<>} {$*=1} {@_3=()} {$_2=~/^(.+?)$(??{{$_3 [$#_3+1]=$1}{$#_3?$_4.='''_''':''''''}{'''^'''}})/} {@_6=(()..$#_3)} {$_7=$#_3} {$_5=$$} {$_4=~/_(??{({$_5 = (45 * $_5 + 555) % (4 ** 5)}=> {$_11 = $_5 % $_7}=>{@_6[$_7=>$_11] =@_6[$_11=>$_7]} => $_7+=$_1) })/} {$_4.='''_'''}{$_4=~/_(?? {( $_8 .= $_3[$_9].''' => '''.$_3[$_6[$_9++]].''' ''' ) })/ } &$_8' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w x y z Actually, it doesn’t work with perl 5.10.x or later because $*, (deprecated) variable has been removed. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT final season "lipstick on an after-image" % cat members.txt | perl -e '{ $_1='''%'''|'''('''.1 } {$/ =''''''} {$_2=<>} {$*=1} {@_3=()} {$_2=~/^(.+?)$(??{{$_3 [$#_3+1]=$1}{$#_3?$_4.='''_''':''''''}{'''^'''}})/} {@_6=(()..$#_3)} {$_7=$#_3} {$_5=$$} {$_4=~/_(??{({$_5 = (45 * $_5 + 555) % (4 ** 5)}=> {$_11 = $_5 % $_7}=>{@_6[$_7=>$_11] =@_6[$_11=>$_7]} => $_7+=$_1) })/} {$_4.='''_'''}{$_4=~/_(?? {( $_8 .= $_3[$_9].''' => '''.$_3[$_6[$_9++]].''' ''' ) })/ } &$_8' prohibits: " , - 0 ; a b c d e f g h i j k l m n o p q r s t u v w x y z We are seeking a mature individual with excellent shuffle skills. YAPC::ASIA 2010 LIGHTNING TALKS

THERE ARE SO MANY WAYS TO SHUFFLE IT the end YAPC::ASIA 2010 LIGHTNING TALKS

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There are so many ways to shuffle it

by Koichi Taniguchi on Oct 16, 2010

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There are so many ways to shuffle it — Presentation Transcript