commit 4bee69d8b1f8a63044ebb1f24b71b1e9aef03190
Author: rhiannon morris <rhi@rhiannon.website>
Date:   Tue Jan 25 16:58:45 2022 +0100

    days 1–7 [except 3b]

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..72c9a69
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+test
+input*
diff --git a/aoc.bqn b/aoc.bqn
new file mode 100644
index 0000000..953e41d
--- /dev/null
+++ b/aoc.bqn
@@ -0,0 +1,95 @@
+ReadInt ⇐ (+ ⟜ (10⊸×))´ ∘ (-⟜'0') ∘ ⌽
+IntFile ⇐ ReadInt¨ •FLines
+
+aoc1 ⇐ {
+  A ⇐ +´ ∘ (>⟜(∞⊸»)) ∘ IntFile
+  B ⇐ +´ ∘ (>⟜(∞⊸»)) ∘ (+´˘) ∘ (3⊸↕) ∘ IntFile
+}
+
+################################################################################
+
+Split  ⇐ ((+`׬) - ⊢)∘= ⊔ ⊢  # from bqn crates lmao
+Words  ⇐ ((0≠≠)¨⊸/) ∘ (' '⊸Split)
+CSV    ⇐ ','⊸Split
+CSVInt ⇐ ReadInt¨ CSV
+
+aoc2 ⇐ {
+  Move1 ← { "forward" 𝕊 x: x‿0; "down" 𝕊 y: 0‿y; "up" 𝕊 y: ⟨0,-y⟩ }
+  Move ← Move1⟜ReadInt´ ∘ Words
+  MoveFile ← Move¨ ∘ •FLines
+  DoMoveB ← {dx‿da 𝕊 x‿y‿a : ⟨x+dx, y+(dx×a), a+da⟩}
+
+  A ⇐ ×´ +´ ∘ MoveFile
+  B ⇐ ×´ ∘ (2⊸↑) ∘ (0‿0‿0⊸(DoMoveB´)∘⌽) ∘ MoveFile
+}
+
+################################################################################
+
+FromBin ⇐ +´ 2⊸⋆∘↕∘≠ × ⌽
+BitFile ⇐ (-⟜'0') ∘ > ∘ •FLines
+
+aoc3 ⇐ {
+  Most ← ⊑ ∘ ((⍒⊒) ⊸ ⊏)
+  Gamma ← Most˘ ∘ ⍉ ∘ BitFile
+
+  A ⇐ ¬⊸(×○FromBin) ∘ Gamma
+}
+
+################################################################################
+
+aoc4 ⇐ {
+  BingoFile ← {
+    lines ← •FLines 𝕩
+    picks ⇐ CSVInt ⊑lines
+    boards ⇐ ReadInt¨ > Words¨ 1⊸↓˘ ∘‿6 ⥊ 1↓lines
+    states ⇐ boards <⊸(≡◶⊣‿0¨`) picks
+  }
+
+  Win ← ∨´ ((∧´ 0⊸≡)˘)∘(⍉∾⊢)
+  Score ← +´⥊
+
+  A ⇐ {
+    picks‿states ← BingoFile 𝕩
+    ⊑ 0⊸≠⊸/ +´¨ picks × (Score × Win)˘¨ states
+  }
+
+  B ⇐ {
+    picks‿states ← BingoFile 𝕩
+    pick‿cur‿prev ← ⊑ ((∧´ Win˘)¨ states) / (picks ∾¨ states ⋈¨ »states)
+    pick × Score (¬Win˘ prev) / cur
+  }
+}
+
+################################################################################
+
+aoc5 ⇐ {
+  VentFile ← ReadInt¨∘∾∘(CSV¨ 0‿2⊸⊏)∘Words¨ •FLines
+  To ← {𝕨≡𝕩? 𝕩; ⌽⍟(𝕨>𝕩) (𝕨⌊𝕩) ↓ ↕(1+𝕨⌈𝕩)}
+  DrawLine ← {x1‿y1‿x2‿y2: (x1 To x2) ⋈¨ (y1 To y2)}
+  Orth ← {∨´ =´ <˘ 2‿∘ ⥊ 𝕩}
+  Danger ← {1⊑ /⁼ ⊒ ∾DrawLine¨ 𝕩}
+  A ⇐ Danger (Orth¨⊸/ VentFile), B ⇐ Danger VentFile
+}
+
+################################################################################
+
+aoc6 ⇐ {
+  FishFile ← /⁼∘CSVInt∘⊑∘•FLines
+  Step ← (⊑ × (/⁼6‿8)˙) +○(9⊸↑) «
+  Fishies ← {+´ Step⍟𝕨 FishFile 𝕩}
+  A ⇐ 80⊸Fishies, B ⇐ 256⊸Fishies
+}
+
+################################################################################
+
+aoc7 ⇐ {
+  CrabFile ← CSVInt∘⊑∘•FLines
+
+  Range ← {l + ↕(⌈´𝕩)¬(l←⌊´𝕩)}
+
+  FuelA ← +´              ∘| -
+  FuelB ← +´∘(÷⟜2)∘(⊢×+⟜1)∘| -
+
+  _Go ← {⌊´ ps⊸𝔽¨ Range ps←CrabFile 𝕩}
+  A ⇐ FuelA _Go, B ⇐ FuelB _Go
+}