62
votes
Accepted
57
votes
N-dimensional N^N array filled with N
Python, 32 bytes
lambda n:eval('['*n+'n'+']*n'*n)
Try it online!
Makes a string like "[[[n]*n]*n]*n" with ...
- 144k
50
votes
Accepted
Cheating a multiple choice test
Jelly, 7 6 bytes
_/ị“ḃ»
Typing on phone. Will add description.
(1,0) goes to A, ...
- 21.4k
49
votes
Be the First 1 (leave only the first Truthy)
Python 2, 35 bytes
while 1:b=input();print b;True&=b<1
Try it online! Input and output are lines of True/False.
Based on Dennis's solution. Redefines the ...
- 144k
43
votes
Accepted
Lossy Sorting (Implement Dropsort)
APL, 9 bytes
⊢(/⍨)⊢=⌈\
This is a monadic function train with diagram:
┌─┼───┐
⊢ ⍨ ┌─┼─┐
┌─┘ ⊢ = \
/ ┌─┘
⌈
The ...
- 21.4k
43
votes
Moving modest minimum
Python 2, 41 bytes
lambda l:[sorted(l)[x==min(l)]for x in l]
Try it online!
For each element x we check whether ...
- 144k
42
votes
Accepted
Flatten the Array!
K, 3 bytes
,//
This is a fairly common idiom. "Join over converge".
try it here with oK.
How it works:
Join (,) fuses ...
- 5,042
42
votes
Accepted
Count trailing truths
Dyalog APL, 6 2 bytes
⊥⍨
Test it on TryAPL.
How it works
⊥ (uptack, dyadic: decode) performs base conversion. If the left operand is a vector, it performs ...
- 210k
41
votes
Remove surrounding zeroes of a 2d array
Wolfram Language (Mathematica), 42 bytes
#&@@CellularAutomaton[{,{},0{,}},{#,0},0]&
Try it online!
Cellular automata are indeed the answer to life, the ...
- 13.8k
40
votes
Output a string's cumulative slope
Python, 29 bytes
lambda s:ord(s[-1])-ord(s[0])
The sum of the differences forms a telescopic series, so most summands cancel out and
(s1 - s0) + (s2 - s1) + &...
- 210k
39
votes
Flatten the Array!
JavaScript (ES6), 35 bytes
Inspired by @user81655's answer:
f=a=>a.map?[].concat(...a.map(f)):a
- 1,097
39
votes
Accepted
Is it true? Ask Jelly!
Jelly, 3 bytes
ṭFẠ
F flattens the input list.
ṭ tacks on the original input list as an ...
- 3,664
36
votes
Xorting an array
Pyth, 40 36 31 30 bytes
Ju.|G^2slHxMf>FT.:Q2Z|tSIxRJQJ
Try it online: Demonstration or Test Suite
Each of the big test-cases finishes in a couple of seconds. ...
- 21.9k
36
votes
Accepted
Be the First 1 (leave only the first Truthy)
APL, 2 bytes
<\
Evaluates to the function "scan using less-than".
Try it online!
Explanation
In APL, the operator \ (...
- 42.5k
36
votes
Covering a Skyline with brush strokes
JavaScript (Node.js), 38 bytes
a=>a.map(v=>(n+=v>p&&v-p,p=v),p=n=0)|n
Try it online!
Simply a greedy algorithm which scan from left to right, ...
- 34k
35
votes
35
votes
Remove every N-th N
awk, 10 bytes
Input is expected on STDIN, one number per line.
++a[$1]%$1
Explanation
Keeps a counter for each number in an associative array, prints only if ...
- 2,527
34
votes
34
votes
Execute a Superb Shuffle™
Ruby, 31 bytes
->x{(0..53).map{|r|x[r*17%54]}}
Try it online!
Explanation:
I'm picking one card, then skipping over the next 16 and start from the first card ...
- 21.3k
33
votes
Turn an integer n into a list containing it n times
Jelly, 1 byte
x
Try it online!
Note that this is not the “repeat n n times” built-in — ...
- 68.1k
33
votes
Sum the array times n, except the last
J, 3 bytes
That was fun to find.
&+/
Try it online!
How it works
10 (&+/) 3 1 4 1 5 will bind ...
- 11.3k
32
votes
32
votes
Accepted
31
votes
Consolidate an Array
Pyth, 3 bytes
!DQ
Explanation:
Q Input
!D Sort by logical NOT
Try it here.
- 21.4k
31
votes
Accepted
Zigzagify a Matrix
J, 31 30 14 12 11 bytes
[:;<@|.`</.
Ych. Too big.
Takes a matrix as input.
Explanation
J has an advantage here. There's a command called oblique (...
- 11.3k
31
votes
Detect heat waves
C (gcc), 88 75 73 bytes
Saved two bytes thanks to ceilingcat.
h,e,a;t(int*_){for(h=e=a=0;*_;h+=e>4&a>2)e=*_<25?a=0:++e,a+=*_++>29;e=h;}
Try it ...
- 7,341
31
votes
Covering a Skyline with brush strokes
05AB1E, 8 7 5 bytes
Saved 2 bytes thanks to @Adnan
0š¥þO
Try it online!
How?
This is using the algorithm that was first found by @tsh. If you like this answer, ...
- 188k
30
votes
29
votes
Yahtzee Small Straight Detection
MATL, 7 12 11 9 8 6 bytes
Thanks a lot to @lirtosiast for removing 2 bytes
ud7BXf
Truthy is an array of nonzero values. Falsy is empty array (no output displayed).
...
- 104k
29
votes
Implement Takewhile
Mathematica, 18 bytes
#~TakeWhile~EvenQ&
Another glorious built-in that is beaten by a factor of 3 by golfing languages without the built-in...
- 196k
Only top scored, non community-wiki answers of a minimum length are eligible