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Solve AOC day 1.2

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This commit is contained in:
Nat Quayle Nelson
2020-12-01 14:46:48 -07:00
parent 1ea1080470
commit 3a36275980
2 changed files with 25 additions and 11 deletions
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35
projects/advent-of-code/src/year2020/Solutions.kiss
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@@ -2,12 +2,18 @@
// Day 1
// TODO implement unless
// TODO list destructuring a funcall results in double evaluation
(let [[a b] (pairWithSum 2020 [1721 979 366 299 675 1456])]
(when !(and (= 1721 a) (= 299 b))
(let [p (pairWithSum 2020 [1721 979 366 299 675 1456])]
(when !(and (has p 1721) (has p 299))
(throw "pairWithSum is broken")))
(let [[a b] (pairWithSum 2020 (readInts "src/year2020/inputs/day1-1.txt"))]
(when !(= 545379 (* a b))
(throw "pairWithSum is broken"))))
(throw "pairWithSum is broken")))
(let [t (trioWithSum 2020 [1721 979 366 299 675 1456])]
(when !(and (has t 675) (has t 366) (has t 979))
(throw "trioWithSum is broken")))
(let [[a b c] (trioWithSum 2020 (readInts "src/year2020/inputs/day1-1.txt"))]
(when !(= 257778836 (* a b c))
(throw "trioWithSum is broken"))))
// TODO implement .method readerexps and use them instead of let:
(defun readLines [file]
@@ -19,17 +25,24 @@
(defun readInts [file] (let [lines (readLines file)] (lines.map Std.parseInt)))
(defun :kiss.List<Int> pairWithSum [sum :kiss.List<Int> numbers]
(deflocal :Map<Int,Int> numbersMap (new Map))
// Put the numbers in a map for random access. This gives an O(n) solution
(doFor number numbers
// TODO implement dict-set, dict-get, set-nth, and use them
(set (nth numbersMap number) (- sum number)))
// TODO implement early return, break
(deflocal :Map<Int,Int> numbersMap (new Map))
(deflocal &mut pair null)
(doFor number numbers
// TODO implement dict-set, dict-get, set-nth, and use them
(set (nth numbersMap number) (- sum number))
(let [requiredForPair (nth numbersMap number)]
(when (numbersMap.exists requiredForPair)
(set pair (or pair [number requiredForPair])))))
pair)
// TODO implement early return, break
pair)
(defun :kiss.List<Int> trioWithSum [sum :kiss.List<Int> numbers]
(deflocal &mut trio null)
(doFor number numbers
(let [requiredForTrio (- sum number)
pairThatSatisfies (pairWithSum requiredForTrio numbers)]
(when pairThatSatisfies
(set trio [number (nth pairThatSatisfies 0) (nth pairThatSatisfies 1)]))))
trio)

1
src/kiss/Kiss.hx
View File

@@ -51,6 +51,7 @@ class Kiss {
k.defAlias("print", "Prelude.print");
k.defAlias("map", "Lambda.map");
k.defAlias("filter", "Lambda.filter");
k.defAlias("has", "Lambda.has");
while (true) {
stream.dropWhitespace();