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If you're not required to use the standard cpython implementation of python, you can usually get a significant speed increase by running your code with PyPy.
Ruby, 77 bytes ->x{(2..16).max_by{x.to_s(_1).chars.sum{|y|"".bytes[y.hex]}}} Attempt This Online!
Python 3, 183 181 175 bytes def f(a,b): c=a;a=str(a) for i in range(b): y=0;z=9 for j in range(len(a)): if y<int(a[j]):y=int(a[j]) if z>int(a[j]):z=int(a[j]) c=int(a)+...
Binary and code plastered a lot One of the more generic ways of adding design to a code challenge site. The binary digits can be plastered around the header in a way that it looks cryptic. But bin...
PHP, 55 27 21 bytes Hello, <?=$argv[1]?>! Try it online! Golfed 28 bytes thanks to my Software CD post. Golfed 6 bytes thanks to @Shaggy's advice.
PHP, 114 bytes <?php for($i=1;$i<101;$i++){if($i%3!=0&$i%5!=0){echo$i;}if($i%3==0){echo"Fizz";}if($i%5==0){echo"Buzz";}echo"\n";} Try it online! As someone who doesn't code much in...
PHP, 36 bytes <?php $x=(int)fgets(STDIN);echo$x%2; Try it online! Outputs 1 if odd and 0 if even.
Rockstar, 40 bytes listen to N say "listen to N say N-0+"+N Which outputs P2, where X is the input from P1: listen to N say N-0+X Try it here (Code will need to be pasted in)
PHP, 57 bytes <?php $x=0;$y=1;while(1){echo(string)($x+=$y)." ";$y+=2;} Try it online! PHP's a nice language, I tell ya.
Haskell, 45 bytes foldl(\a b->zipWith((-).(*b))(0:a)$a++[0])[1] Try it online! Uses the "highest power first" convention. Sometimes multiplies the polynomial by $(-1)$.
Set arrays without array() In a few occasions, setting an array using array() can be a bit costly. Thankfully, you can assign an array like how to assign a Python list. <?php $a=["Hello","Ma...
JavaScript (Node.js), 58 bytes ([x,...r],y)=>x?[0,...y=f(r)].map((v,i)=>v-x*(y[i]|0)):[1] Try it online!
Haskell, 74 bytes a=ord 'a' n!c|isLetter c=chr((rem((ord c -a)+n) 26)+a)|True=c f n=map (n!) Try it online!
Haskell, 47 bytes l=length f s=(l(words s),l s,l$filter(/= ' ')s) Try it online!
| == or This bitwise operator can sometimes be used as the replacement for or. a=-2;b=3 if(a>0)|(b>0):print(a+b) Try it online!
shortC, 38 bytes Bs){Rs="Bs){Rs=%c%s%c,34,s,34",34,s,34 Try it online! From GeeksForGeeks's C implementation.
shortC, 78 bytes i,j;f(Ix,Iy,I*p){R"[");O;i<x;i++)Oj=0;j<y;j++)*p++&&R"[%d,%d],",i,j);J"\b]");} Try it online! From @Lundin's C (gcc) answer.
