Official hints:
| [all] | There are two "wildcard solutions" that each can be used to solve nearly all of the exercises. Due to the no-reuse rule you can use each of them only once, and they're officially used for exercises 3 and 13.
| [1-5] | Just explore all kind of scalar references. If you're really desperate you can plow through Perl_sv_2pv_flags() in sv.c in the perl source code to see exactly how references get stringified.
| [3] | Good candidate for wildcard one: Find a way to override the meaning of the regex.
| [4,8] | The pattern of exercise 4 is misleading, but the search down this incorrect path may reveal the solution to exercise 8. Exercise 4 is actually simpler than you'd think.
| [5] | A fairly recent and unknown class of built-in objects.
| [6] | Alias. (Last year there was a similar one which could be solved by manipulating $[. I tried to prevent that this year, though initially without success)
| [7] | Make modification fail.
| [8] | Find something that fails to get assigned anywhere. See also hint about 4 and 8 above. The ability to acquire this thing at all is most likely a bug.
| [9] | Subtly perturb the meaning of the regex.
| [10] | Have $foo change as a result of the first part of the predicate test.
| [11] | Find a way to scribble onto $| so rudely it never gets properly turned into 0 or 1. This mechanism is most likely a bug.
| [12] | Find a variable that ignores being assigned to. This behaviour is most likely a bug.
| [13] | The best spot for wildcard two: A feature was added in 5.8 with which you can modify constants.
| | | | | | | | | | | | |
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
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
Outside of code tags, you may need to use entities for some characters:
| |
For: |
|
Use: |
| & | | & |
| < | | < |
| > | | > |
| [ | | [ |
| ] | | ] |
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
|
|
