Search Results
Search type | Search syntax |
---|---|
Tags | [tag] |
Exact | "words here" |
Author |
user:1234 user:me (yours) |
Score |
score:3 (3+) score:0 (none) |
Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
Views | views:250 |
Code | code:"if (foo != bar)" |
Sections |
title:apples body:"apples oranges" |
URL | url:"*.example.com" |
Saves | in:saves |
Status |
closed:yes duplicate:no migrated:no wiki:no |
Types |
is:question is:answer |
Exclude |
-[tag] -apples |
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Palindromes are words, phrases, representations of numbers or times which read the same in reverse, for example "level", "reviver", "12321", "10:01". See also the [balanced-string] tag.
1
vote
Numbers that can be negated by reading backwards
Perl 5, 134 bytes
while(++$n){for$c("",0){$_="T"x$n;s/T/1/;do{($b=reverse)=~y/1T/T1/;print"$_$c$b$/"}while(/(?=[T0]1*$)/g&&substr($_,pos)=~y/T01/01T/)}}
Like some other answers, it uses string manip …