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Given a chess board with some knights on it, say how many squares are neither attacked by a knight nor containing a knight. Input An 8 by 8 grid where each square is either a knight or empty T...
The problem Someone has created an encoding format for square bit matrices, however they have found it isn't perfect! One encoding may not decode to exactly one matrix, or it may not even be possi...
Task Given a list of numbers $X$ produce a second list of numbers $Y$ such that $Y_i$ is the length of the longest common prefix of $X$ and $X$ with the first $i$ elements removed. For example if...
Given a string, convert all of its letters using ROT13, and all of its digits using ROT5. This is sometimes referred to as ROT13.5. Input A sequence of printable ASCII characters (character cod...
The probability of rolling every number from 1 to 6 with $N$ six-sided dice. Input A positive integer $N$. Your code must work for inputs up to and including 10, but may crash, error, or give ...
JavaScript (V8), 44 bytes a=>a.map((a,x)=>a.map((n,y)=>n&&print(x,y))) Try it online!
APL (Dyalog Unicode), 21 bytes {×⍵-+/∪⍵∨¯1↓⍳⍵}¨∘⍳⊢⌸⍳ Try it online! Returns a matrix (padded with zeroes) where the first row is deficient numbers, the second is perfect numbers, and the thi...
Vyxal, 30 28 25 bytes Saved 1 4 bytes thanks to Aaron Miller ƛ∆K-±";£kɽƛ¥D„£_'t¥=;vṪ,£ Try it Online! A rather pitiful answer, but hey, it works. Gives deficient numbers, then perfect numbers...
Vyxal o, 16 bytes '∆K=;,'∆K<;,'∆K> Try it Online! Checks all numbers to see if they are perfect, then prints the ones that are, then does the same for abundant and deficient numbers. Ex...
Risky, 1 byte 0? Try it online! 0 transpose ? input
Jelly, 1 byte Ḃ Try it online! Builtin. Returns 0 for even and 1 for odd
Japt, 1 byte u Japt, more like JABT (just another builtin) :P Try it
JavaScript (Node.js), 6 bytes n=>n%2 Try it online! Basically does what you'd expect.
Scala -language:postfixOps, 2 bytes 1& Try it online! 1 for odd, 0 for even. Scala, 3 bytes _%2 Try it online! 1 for odd, 0 for even.
Python 3, 98 bytes print(str(eval("("+input().replace(" ",")*(").replace("i","j")+")")).strip("()").replace("j","i")) Try it online! Since the input format is restrictive, I may as well just...
Few QoL improvements can be made: Some trivial challenges(i.e. "Hello World!") get many, many answers, so the leaderboard should show a scrollbar beyond some point(after the first 10 submissions, ...
Python 3, 61 bytes lambda n,m:sum(randint(1,m)for i in[0]*n) from random import* Try it online! This is not an interesting answer as it is just a copy of your code. I tried to do it with ch...
Vyxal s, 5 bytes 2=A[5 Try it Online! You're not the only one who can abuse flags, Shaggy... 2= # Foreach, is it equal to to? A[ # If all are 2 5 # Push a 5. # (s flag) sum...
C (gcc), 35 32 bytes Saved 3 bytes thanks to Lundin f(n){n&&f(n/2);putchar(n&1|48);} This solution exploits that leading zeros, while not required, are also not forbidden by the ...
Since no one has posited anything yet... I think everything but the last three bullets can be kept. Other than that, we could add in the tips about challenge specifications. Challenges Posting...
If you print some string s without a newline character at the end, instead of print(s,end="") write print(end=s) to save two bytes. Note that this only works for strings, not for other typ...
Inspired by this Rosetta Code article. Introduction Balanced Ternary is a method of representing integers using -1, 0 and 1 in base 3. Decimal 11 = (1 * 32) + (1 * 31) + (−1 * 30) = [1,1,-1] or ...
JavaScript (Node.js), 78 bytes (m=(a,b=26,c=a(--b))=>b?[c,...m(a,b),c]:[c])=>m(a=>m(b=>(c=25-a-b)<0?32:c+65)) Try it online!
