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Code-golf is a competition to solve a particular problem in the fewest bytes of source code.
1
vote
Output ISO8601 date string from seconds and nanoseconds
Python 3.8 (pre-release) 106, 81 bytes
lambda a,b:datetime.fromtimestamp(a+b//1e3/1e6).isoformat()
from datetime import*
Try it online!
2
votes
0
answers
87
views
Generate square sub-matrices of 1's [duplicate]
Back again, stealing another question from stackoverflow.
You are given a list of integers >= 0. Generate in order square 1-matrices where the side length is given by the list entry of the current in …
1
vote
Remove loops from a walk
Python 3.8 (pre-release), 168 164 163 126 125 bytes
l=[p:=0]
n=""
for s in input():
if(p:=p+1j**(ord(s)%15))in l:x=l.index(p);l=l[:x+1];n=n[:x];p=l[x]
else:l+=[p];n+=s
exit(n)
Try it online!
…
12
votes
11
answers
3k
views
Simulate a 1D Game-of-Life-ish Model
This question just trended over on code-review and I figured you might like it adapted as a codegolf challenge:
You are given a non-empty list of x houses represented as booleans. Each day, the house …
4
votes
Print the last, middle and first character of your code
Python 3, 19 bytes 13 bytes
print( ')(')
The print function appends a newline by default so the code starts with a newline. The last character of the code is a ")" so that's printed first. To make t …
7
votes
14
answers
4k
views
Output ISO8601 date string from seconds and nanoseconds
One reason why ISO8601 is the best date string format, is that you can simply append as much precision as you like. Given 2 integers representing seconds and nanoseconds that have passed since 1970-01 …
4
votes
Output a Super Mario Image
Python3, 921 916 752 751 539 534 476 bytes
And here's a mandatory fair version. I used a script to count the individual characters, should be identical:
w,s,d,r=' *.#'
m='--'
n=m*5
A=d*2
B=d*3
C=d*4
D …
17
votes
14
answers
3k
views
Generate a random point outside a given rectangle within a map
Introduction
Given this visualization of a playing field:
(0,0)
+----------------------+(map_width, 0)
| A |
|-----+-----------+----|
| D | W | B |
|-----+-----------+--- …
0
votes
Print/Output all positive numbers in which every multi-digit substring in its decimal repres...
Python 3.8 (pre-release), 194 bytes
r=range
s=str
l=lambda _:len(s(_))
[*map(print,[t for t in r(1,10**4) if all(all(int(x)%b for b in r(2,int(x))) for x in [s(t)[i:j+1] for i in r(l(t)) for j in r …