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Complete an equivalence relation
In set theory, a relation from a set \$A\$ to a set \$B\$ is a set of pairs of elements from \$A\$ and \$B\$. For example, \$\{(1, 5), (1, 6), (2, 4), (3, 5)\}\$ is a relation from the set \$\{1, 2, 3\}\$ to the set \$\{4, 5, 6\}\$.
A relation \$R\$ from a set \$...
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Just because the reverse and palindrome were not too challenging individually :)
Write a program (full program or function) that satisfies the following: given a string input,
the program as-is outputs the input string unchanged.
the program reversed outputs the input string reversed.
the progra...
This was prompted by the recent meta post about byte compression in scores, as well as other bits of confusion and uncertainty I've seen on the site.
If you've been around on the main site in the last 4 months, you may have noticed answer headers like these:
And you may have wondered "hang ...
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Some built-in functions in PHP return mixed types, like file_get_contents that returns both string or false. Union structs in C can be used to simulate this, but is there a way to make it polyglot, that is, can be run in both PHP and C without (major) modification? Macros is often one way.
$resul...
The task is to calculate the average "funniness" of a given number given the following scoring system:
1 point for each "420" in it
2 points for each "69" in it
3 points if its an anagram
4 points if it has (not for each) "8008135"
5 points for ending in "420"
6 points for ending in "69"
Then, ...
