 Keep It Simple, Stupid PerlMonks

### comment on

 Need Help??
Does this mean that the implementation must actually choose C before displaying it digit by digit? Or would it (theoretically) be okay if the digits were chosen as they are being displayed (i.e. the second digit is not known to the program before the first has been shown)?

As my own attempt uses on the latter approach, I have to say it is acceptable. Others are free to disagree and discount my attempt. Here is how I justify it. Istarted out with this to fulfill the 'spec':

```#! perl -slw
use strict;

\$|++;

sub r{int rand pop}

my \$n = pop;
my @c = map int rand 10,1..\$n;
my @x = (0) x \$n;

for my \$d ( 0 .. \$n -1 ){
map{
\$x[ \$d + r( \$n - \$d ) ] = r( 10 );
printf "\r@x";
\$x[ \$d ] = \$c[ \$d ]
}1..1e5
}

I then started golfing and here are the steps I went through:

```-e"sub r{int rand(pop||10)};@c=map{r}1..(\$n=pop);for\$d(0..\$n-1){map{\$x
+[\$d+r(\$n-\$d)]=r,print qq[@x\r]}1..1e5;\$x[\$d]=\$c[\$d]}"

-e"sub r{int rand(pop||10)};\$n=pop;@c=map{r}1..\$n;for\$d(0..\$n-1){map{\$
+x[\$d+r(\$n-\$d)]=r,print qq[@x\r]}1..1e5;\$x[\$d]=\$c[\$d]}"

-e"\$n=pop;for\$d(0..\$n-1){map{\$x[\$d+rand(\$n-\$d)]=int(rand 10),print qq[
+@x\r]}1..1e5;}"

-e"for\$d(0..(\$n=pop)-1){map{\$x[\$d+rand(\$n-\$d)]=int(rand 10),print qq[@
+x\r]}1..1e5}"

-l15e"for\$d(0..(\$n=pop)-1){map{\$x[\$d+rand(\$n-\$d)]=int(rand 10),print @
+x}1..1e5}"

-l15e"for\$d(0..(\$n=pop)-1){\$x[\$d+rand(\$n-\$d)]=int(rand 10),print@x,for
++1..1e5}"

-l15e"for\$d(0..(\$n=pop)-1){\$x[\$d+rand(\$n-\$d)]=rand(10)&15,print@x,for+
+1..1e5}"

-l15e"for\$d(0..(\$n=pop)-1){\$x[\$d+rand\$n-\$d]=rand(10)&15,print@x,for+1.
+.1e5}"

At the transition from step 2 to step 3, I notice that I had these 3 pieces of code:

1. @c=map{r}1..\$n;

Put random digits into @c.

2. \$x[\$d+r(\$n-\$d)]=r

put a random digits into \$x[...].

3. \$x[\$d]=\$c[\$d]

replace the random digit in @x with corresponding (random digit) from @c.

Which is equivalent to \$tmp = val; \$target = other value; \$target = \$tmp.

Eliminating the temporary value and intermediate steps is the essence of golf, so I conclude that step 3 above is logically equivalent to step 2. Others may wish they had thought of it...or condemn it as a step too far?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^2: Golf: Movie style code cracker. by BrowserUk
in thread Golf: Movie style code cracker. by BrowserUk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

• Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
• Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
• Read Where should I post X? if you're not absolutely sure you're posting in the right place.
• Posts may use any of the Perl Monks Approved HTML tags:
a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
• You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
 For: Use: & & < < > > [ [ ] ]
• Link using PerlMonks shortcuts! What shortcuts can I use for linking?

Create A New User
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others studying the Monastery: (3)
As of 2020-12-05 00:15 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?
How often do you use taint mode?

Results (63 votes). Check out past polls.

Notices?