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#!/usr/bin/env BQN
#
# Utilities
#
IsAsciiNum ← ('0'⊸≤∧≤⟜'9')
ReadInt ← (10⊸×+⊣)´∘⌽-⟜'0' # stolen from leah2
ReadInput ← {•file.Lines ∾ •path‿"/input/day"‿(•Fmt 𝕩)}
#
# 2021-12-01
#
# part 1
day1ExampleData ← 199‿200‿208‿210‿200‿207‿240‿269‿260‿263
day1Input ← ReadInt¨ReadInput 1
# NB: Because distance from the ground is never smaller than zero, it's
# no problem that nudge inserts a zero at the end of the right list
PositiveDeltaCount ← +´∘(⊢<«)+˝˘∘↕
! 7 = 1 PositiveDeltaCount day1ExampleData
•Out "Day 1.1: "∾•Fmt 1 PositiveDeltaCount day1Input
# part 2
! 5 = 3 PositiveDeltaCount day1ExampleData
•Out "Day 1.2: "∾•Fmt 3 PositiveDeltaCount day1Input
#
# 2021-12-02
#
# part 1
day2ExampleData ← ⟨
"forward 5",
"down 5",
"forward 8",
"up 3",
"down 8",
"forward 2",
⟩
day2Input ← ReadInput 2
ParseSubmarineCommand ← (((↕2)⊸((((-1)⊸⋆)∘(2⊸|))×(=⟜(⌊∘(÷⟜2))))∘("duf"⊸⊐)∘⊑)×ReadInt∘(IsAsciiNum/⊢))
SubmarineDestProduct ← {×´+´ParseSubmarineCommand¨𝕩}
! 150 = SubmarineDestProduct day2ExampleData
•Out "Day 2.1: "∾•Fmt SubmarineDestProduct day2Input
# part 2
SubmarineAimedDestProduct ← {
×´+´((×´)∘(1⊸↓)≍(1⊸⊑))¨ (<0‿0‿0) (⊢∾((⊑∘⌽⊣)+(⊑⊢)))` ParseSubmarineCommand¨𝕩
}
! 900 = SubmarineAimedDestProduct day2ExampleData
•Out "Day 2.2: "∾•Fmt SubmarineAimedDestProduct day2Input
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