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Day 7 cleanup

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This commit is contained in:
Beatrice Szilvasy 2024-12-07 11:38:55 +00:00
parent 2e5c426dcf
commit 6b558d9330
2 changed files with 42 additions and 10 deletions
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25
days/day07.st
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@ -6,7 +6,9 @@ Object subclass: MulOp
^tgt quo: n ] ]
MulOp subclass: CatOp
[ tryDo: n target: tgt
[ | p10 | p10 := 10 raisedTo: ((n + 1) log: 10) ceiling.
[ | p10 |
p10 := (n + 1) ceilingLog: 10.
p10 := 10 raisedTo: p10.
^super tryDo: p10 target: tgt - n ] ]
Object subclass: Equation [
@ -17,24 +19,27 @@ Object subclass: Equation [
printOn: dst [dst << target << ': ' << numbers]
"Backtracking search right-to-left over the number sequence."
canSolveFrom: idx target: tgt with: ops
[ | n | n := numbers at: idx.
[ | n n1 ok | n := numbers at: idx.
idx = 1 ifTrue: [^n = tgt].
tgt < n ifTrue: [^false].
ops do: [
:op |
(op tryDo: n target: tgt) ifNotNil:
[:it|(self canSolveFrom: idx - 1 target: it with: ops) ifTrue: [^true]]].
:op | n1 := op tryDo: n target: tgt.
n1 ifNotNil: [
ok := self canSolveFrom: idx - 1 target: n1 with: ops.
ok ifTrue: [^true] ]].
^false ]
canSolveWith: ops [^self canSolveFrom: numbers size target: target with: ops]
]
Equation class extend [
parse: line
[ ^(line tokenize: ': ') letArrayInBlock:
[ :target :numbers |
Equation new target: target asNumber;
numbers: ((numbers tokenize: ' ') collect: [:it|it asNumber]) ] ]
[^(line tokenize: ': ') letArrayInBlock: [
:target :numbers |
Equation new target: target asNumber;
numbers: ((numbers tokenize: ' ')
collect: [:it|it asNumber])]]
]
AOC input: [ stdin toLines collect: [:line | Equation parse: line] ];
@ -42,6 +47,6 @@ AOC input: [ stdin toLines collect: [:line | Equation parse: line] ];
part2: {CatOp new. MulOp new. AddOp new};
result: [ :eqns :part |
eqns chain select: [:eqn | eqn canSolveWith: part];
collect: [:it|it testValue];
collect: [:it | it testValue];
sum ];
finish.

27
days/utils.st
View file

@ -254,3 +254,30 @@ Object subclass: Grid [
printOn: st [ rows do: [ :r | st << r; nl ] ]
]
Integer extend [
ceilingDiv: denom [ ^((self - 1) // denom) + 1 ]
"The original implementation was incorrect. Here is the correct code:"
ceilingLog: radix [
"Answer (self log: radix) ceiling. Optimized to answer an integer."
<category: 'math methods'>
| me answer |
self < self zero ifTrue:
[^self arithmeticError: 'cannot extract logarithm of a negative number'].
radix <= radix unity ifTrue:
[radix <= radix zero
ifTrue: [^self arithmeticError: 'base of a logarithm cannot be negative'].
radix = radix unity
ifTrue: [^self arithmeticError: 'base of a logarithm cannot be 1'].
^(self floorLog: radix reciprocal) negated].
radix isInteger ifFalse: [^(radix coerce: self) ceilingLog: radix].
me := self.
answer := 1.
[me > radix] whileTrue:
[me := me ceilingDiv: radix. "originally: me // radix."
answer := answer + 1].
^answer
]
]