feat(sterni/aoc/2021): day 2 "solution" r/3221

Change-Id: Ifbd50274f0b09305991a49e7453ac1f13089e57e

1 files changed, 41 insertions, 3 deletions

diff --git a/users/sterni/exercises/aoc/2021/solutions.bqn b/users/sterni/exercises/aoc/2021/solutions.bqn
index 98d70f8f15cf..463b38543f04 100755
--- a/users/sterni/exercises/aoc/2021/solutions.bqn
+++ b/users/sterni/exercises/aoc/2021/solutions.bqn
@@ -4,9 +4,11 @@
 # Utilities
 #
 
+IsAsciiNum ← ('0'⊸≤∧≤⟜'9')
+
 ReadInt ← (10⊸×+⊣)´∘⌽-⟜'0' # stolen from leah2
 
-ReadInput ← {ReadInt¨•file.Lines ∾ •path‿"/input/day"‿(•Fmt 𝕩)}
+ReadInput ← {•file.Lines ∾ •path‿"/input/day"‿(•Fmt 𝕩)}
 
 #
 # 2021-12-01
@@ -15,6 +17,7 @@ ReadInput ← {ReadInt¨•file.Lines ∾ •path‿"/input/day"‿(•Fmt 𝕩)
 # 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
@@ -22,10 +25,45 @@ PositiveDeltaCount ← +´∘(⊢<«)+˝˘∘↕
 
 ! 7 = 1 PositiveDeltaCount day1ExampleData
 
-•Out "Day 1.1: "∾•Fmt 1 PositiveDeltaCount ReadInput 1
+•Out "Day 1.1: "∾•Fmt 1 PositiveDeltaCount day1Input
 
 # part 2
 
 ! 5 = 3 PositiveDeltaCount day1ExampleData
 
-•Out "Day 1.2: "∾•Fmt 3 PositiveDeltaCount ReadInput 1
+•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