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For challenges that involve the physical layout or physical manipulation of source-code.

7 votes

Code 3k to Codee k

Python 2, 9 bytes print 3&3 Try it online! Prints 3. print 3&33 Try it online! Prints 1.
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36 votes

Code 3k to Codee k

Many languages, 4 bytes 16-1 Outputs 15. 16-11 Outputs 5. This is a CW answer for many languages it works for. Edit to add to the list: APL bc Dyvil Haskell I J Japt Javascript REPL Java REPL …
1 vote

Third time the charm

Python 2, 38 bytes 1 id=id<3and-~id exec"print id|1"*0**0 Try it online! (doubled, tripled) Outputs 1, 1, or 3. Python 2, 33 bytes 1 True+=1 exec"print 7%True"*0**0 Try it online! (doubl …
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  • 147k
48 votes
Accepted

Write a Rectangular Program that Outputs the Number of Times it was Rotated

APL (1x3 = 3) 5!3 This solution uses the extra rule that any output that is correct mod 4 works. In APL, x!y is the number of way to choose x elements from y, commonly known as binom(y,x) or choos …
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  • 147k
59 votes

Code close to the challenge: Sum of integers

Python, distance 3 #Given a set of integers, find the sum#of all integers in it. This gives the built-in function sum, which can sum a set like sum({3,5,7})==17. The remaining parts are commente …
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10 votes

Program your favorite phrase

Python 2 (37) After Sarah became president of her local Mensa chapter, she became a focus of romantic attention from men looking for an intelligent partner. On every date, Sarah would try to make a p …
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16 votes

Join N copies of a snippet to produce N^2 characters

Python 2, 22 a='';print a;a+='xx';a Prints the empty string, then two x's, then x' four and so on. With the newline after each string, this comes out to n*n characters. One copy: "\n" (1 char) Two …
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  • 147k
14 votes

Create a square of increasing size by replicating the initial code

Python 2, 22 bytes i=0;i+=1; i print'*'*i Try it online! Doubled: i=0;i+=1; ii=0;i+=1; i print'*'*i print'*'*i Note that the second half starts with a newline character.
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10 votes

Which character to change (Robbers)

Python 3, 53 bytes, cracks dingledooper's 51 bytes r=(1,)*8**9 r=r,len,str=r,str,sum print(len(str(r))) Try it online! Replaces the newline at the end of the second line with st. This is LATIN SMALL L …
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  • 147k
9 votes

Jumblers vs Rebuilders: Coding with Tetris Bricks

Python 3: 212 area [Rebuilt] My code is broken up into the following 53 I-pieces, which I've written one per line alphabetically. (358 0048 0396 0796 0824 0981 1013 1314 1330 1438 1502 2285 2317 247 …
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3 votes

Jumblers vs Rebuilders: Coding with Tetris Bricks

Python 3: 340 area [Rebuilt] Made of 85 I-pieces, given here alphabetized one per line. #Four spaces #Four spaces #Four spaces #Four spaces #Four spaces #Four spaces #Fou …
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3 votes

Jumblers vs Rebuilders: Coding with Tetris Bricks

Python 3: 160 area After feersum's crack, I tried to tighten up my code to make it harder to avoid cryptographic mumbo-jumbo. It's made of 40 I pieces, listed one per row: ') #Two spaces )-d) *'T …
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  • 147k
5 votes

A well linked challenge

Python 2, 74 bytes bmn0=f=lambda s,P={0},d=[]:s<" "if(P in d)else+f(s[f<s:],P^{s[0^0]},[P]+d) Try it online! Iterates through the string, keeping track in P of the set of characters seen an odd …
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  • 147k
6 votes

A well linked challenge

Python 3.8 (pre-release), 66 bytes lambda l,b={id}:len({str(b:=b^{c})for(c)in l})<len(l)#,<^fmnost{}# Try it online! The Era of Assignment Expressions is upon us. With PEP 572 included in Python …
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10 votes

Which character to change (Cops)

Python 2, 23 bytes (cracked by dingledooper) print min(0,0)>min(0,0) Try it online! Should print True. Please don't brute force, I think it's a nice puzzle to solve. Bonus puzzle! Python 2, 23 byte …
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