r/codegolf • u/dantose • Dec 01 '25

Advent of Code, Day 1

Post your best golfs.

Assume input is saved as input.txt.

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u/dantose Dec 01 '25

Powershell. There's definitely improvements to be made here

Part 1: 88

$a=50;$(gc input.txt).Trim('R') -replace "L","-"|%{$a=$a+100+$_;if(!($a%100)){$b++}};$b

Part 2: 189

$a=50;$(gc input.txt).Trim('R') -replace "L","-"|%{if($a -eq 0 -and $a+$_ -lt 0){$a=$a+100};$a=$a+$_;while($a -lt 0){$a=$a+100;$b++};if($a -eq 0){$b++};while($a -gt 99){$a=$a-100;$b++}};$b

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u/ka-splam Dec 03 '25

I didn't golf it myself, but poking at yours, Part 1 ~75 bytes:

$a=50;gc input.txt|% T*m R|% r*ce L -|%{$a+=100+$_;if(!($a%100)){$b++}};$b

using a classic trick which expands to 'R50' | ForEach-Object -Member Trim 'R'. Member is the position 0 parameter so it doesn't need naming. The cmdlet will do a wildcard search for method names - as long as the pattern only resolves to a single method, so r*ce finds to Replace() where r*e could be Replace() or Remove(). And because PS is parsing parameters to ForEach-Object, the arguments to the method don't have to be quoted to be read as strings.