1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
d ← {•BQN ("⟨⟩"∾𝕩) ⊏˜ ("[]"∾𝕩) ⊐ 𝕩}¨•FLines"day18"
Split ← { 𝕊 ⟨l,r⟩: { 𝕊 @: { 𝕊 @: @ ; 𝕊 r2: l‿r2 } Split r ;
𝕊 l2: l2‿r } Split l ;
𝕊 n: n ≥ 10 ? (⌊⋈⌈) n÷2 ;
@ }
Addlm ← { n 𝕊 ⟨l,r⟩: ⟨n Addlm l, r⟩ ; n 𝕊 m : n + m }
Addrm ← { n 𝕊 ⟨l,r⟩: ⟨l, n Addrm r⟩ ; n 𝕊 m : n + m }
Explode ← {
4 𝕊 ⟨l,r⟩: 0‿l‿r ;
d 𝕊 ⟨l,r⟩: { 𝕊 @: { 𝕊 @: @ ;
𝕊 ⟨r2,ln,rn⟩: ⟨ln Addrm l,r2⟩‿0‿rn } (d+1) Explode r ;
𝕊 ⟨l2,ln,rn⟩: ⟨l2,rn Addlm r⟩‿ln‿0 } (d+1) Explode l ;
@
}
Reduce ← { 𝕊 t: { 𝕊 @: { 𝕊 @: t ; 𝕊 t3: Reduce t3 } Split t ;
𝕊 t2: Reduce t2 } ⊑ 0 Explode t }
Add ← Reduce∘⋈
Mag ← { 𝕊 ⟨l,r⟩: (3×Mag l)+(2×Mag r) ; 𝕊 n: n }
•Show Mag Add˜´ ⌽ d
•Show ⌈´⥊Mag∘Add⌜˜ d
|
