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brainfuck, cracked by Aaron Miller, 243 bytes void main(x,y)->{ printf=io.write(z=x-y); printf("+++++[++++>---<]>.+[--->+<]>+++.+.+++.+[---->+<]>+++.[->+++<]&...
Jelly, cracked by m90 13 bytes Should be pretty simple - I'm running out of ideas; one of the downsides of only golfing in 2 languages! “¿×⁶ṆḶN{N=ȷṾ» Try it online!
Japt, 10 bytes o ÅÔò cÔiU Try it o ÅÔò cÔiU :Implicit input of integer U o :Range [0,U) Å :Slice off the first element Ô :Reverse ò ...
Japt -R, 11 bytes ;Bå+ mê ê û Test it ;Bå+ mê ê û ;B :Uppercase alphabet å+ :Cumulatively reduce by concatenation m :Map ê : Palindro...
HTML, 26 13 bytes Hello, World! Golfed 13 bytes thanks to @Razetime's advice.
Japt, 13 bytes o ï æ@¶Xx*Xej Try it o ï æ@¶Xx*Xej :Implicit input of integer U o :Range [0,U) ï :Cartesian product æ :First pair X that r...
Japt v2.0a0, 19 18 17 bytes I need more caffeine! Takes input as an array of lines. Output is a reversed array. [Uc¸¬U¬Ucq\s f]ml Try it - includes all test cases, header splits string on new...
Python 3, 235 185 141 118 bytes a=[[],[],[]] n=1;exec("d=sum(i for i in range(1,n)if n%i<1)-n;a[[[1,2][d<0],0][d>0]]+=n,;n+=1;"*int(input())) print(a) Try it online! Golfed 50 byt...
Japt, 9 bytes All credit to ETH on this one. 9îQi"9îQi Test it 9î :Repeat the following to length 9 Q : Quotation mark i"9îQi : Prepend "9îQi" And, for th...
JavaScript, 29 bytes f=(n,x=0)=>n>0?f(n-1/++x,x):x Try it online!
APL (Dyalog Unicode), 22 bytes ⎕←∘.((1+⍳9)⌽⍨⊣+3×⊢)⍨⍳3 Try it online! Requires zero-indexing. ⎕←∘.((1+⍳9)⌽⍨⊣+3×⊢)⍨⍳3 ⍳3 ⍝ Make the range [0, 2] (row and cols of 3×3 box...
C (gcc), 20 bytes f(a){puts("!"+a%2);} Try it online! Function solution. Prints ! in case of even numbers, otherwise just new line.
h, 4 bytes 1,-1 Neither this program (by VilgotanL) nor the language (by Nerdaxe) are mine, but I think the latter is interesting and so I am submitting the former. Step-by-step guide: Accumu...
Ruby, 8 bytes ->n{n%2} Generic mod-in-a-lambda solution. Alternately, for 2.7+: ->{_1%2} Try it online!
MAWP, 8 bytes @!2P2WA: Try it! 1 for odd and zero for even. mawp doesn't have modulus, so it floor divides by 2, multiplies by 2 and subtracts from the input.
Make the Server Fault logo using the following criteria: The boxes' measurements: There are 3 columns of 5 boxes, with long ones at the left where the rest are regular. The following measure...
C (compliant), 106 bytes char r,i,s[80];void f(int n){memset(s,32,79);for(;r<n;puts(s),r++)for(i=0;i++<n*2;s[n-r-1]=47,s[n+r]=92);} Try it online! Standard C compliant function solutio...
C (gcc), 153 bytes a,b;f(char*s){for(char*c,*o="idso";*s;s++)for(c=o;*c;c++)*s==*c&&(b=c-o,a+=!b,a-=b==1,b==2?a*=a:0,b==3&&printf("%d%c",a,s[1]?44:10),a==-1|a==256?a=0:0);} Tr...
Japt -h, 12 bytes à kÈäÎdÄÃmÊñ Try it à kÈäÎdÄÃmÊñ :Implicit input of array à :Combinations k :Remove elements that return true È :When pass...
I suggest we have some status tags for Sandbox. In particular, one like "status-finalized" instead of manually (and therefore inconsistently and not searchable) changing the title to say "[FINALIZE...
Perl 5 -pMRoman, 10 bytes (17 if including command-line switches) $_=Roman$_
