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xpqz/aoc202003.dyalog

Created December 3, 2020 08:41
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Advent of Code 2020, Day03 in Dyalog APL
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aoc202003.dyalog
⎕IO←0
DAY03←↑⊃⎕NGET'data/2020/day03.txt'1
Slope←{
(dy dx)←⍵
d←⍺
0 {
(y x)←⍵
y≥0⊃⍴d:⍺
(⍺+'#'=d[y;(1⊃⍴d)|x])∇dy dx + y x
} 0 0
}
⊢result←DAY03∘Slope¨(1 1)(1 3)(1 5)(1 7)(2 1)
assert 203=1⊃result ⍝ Part 1
assert 3316272960=×/result ⍝ Part 2
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