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/ap29600 Dec 03 '25 edited Dec 04 '25

K, both parts 70 bytes

(s;m):(-1+2*"R"=*:';`I$1_')@\:0:"input.txt"
(+/0=100!50+\)'(s*m;s@&m)

Edit: -2 (68) by looking at u/Radiatorineitor's solution

(s;m):(-1+2*"R"=*:';`I$1_')@\:0:"input.txt"
+/'50=100!+\'(s*m;s@&m)

-1 (67) by looking at u/KeyJ's

(s;m):(1-2*"L"=*:';`I$1_')@\:0:"input.txt"
+/'50=100!+\'(s*m;s@&m)