day03.ijs - adventofcode2020 - Advent of Code 2020 (adventofcode.com) in J and Clojure

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d =: (3000&$;._2) 1!:1 < 'day03'
slop =: 3 : '+/''#''= d{~ y <@:*"_ 0 i.>.(#d)%{.y'

slop 1 3   NB. 270
*/ slop&> (1 1; 1 3; 1 5; 1 7; 2 1)  NB. 2122848000