Toot

Written by Russ Cox on 2024-12-04 at 14:45

Day 4 part 1 https://adventofcode.com/2024/day/4 #AdventOfCode

pad dot-pads the matrix to avoid wraparound.

x y shift m rotates the matrix x left, y down.

d(=x y) shift4 m produces the 4 matrices shifted by d*0 1 2 3.

d XMAS m identifies the X in XMAS in direction d.

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