From f8ad83587f9e93440a2de7214822d3f590f2b992 Mon Sep 17 00:00:00 2001 From: xenia Date: Fri, 9 Dec 2022 18:43:15 -0500 Subject: [PATCH] day 9: very late --- 9.rkt | 114 +++ inputs/9 | 2000 ++++++++++++++++++++++++++++++++++++++++++++++++ inputs/9-test1 | 8 + inputs/9-test2 | 8 + 4 files changed, 2130 insertions(+) create mode 100644 9.rkt create mode 100644 inputs/9 create mode 100644 inputs/9-test1 create mode 100644 inputs/9-test2 diff --git a/9.rkt b/9.rkt new file mode 100644 index 0000000..4e9a9b6 --- /dev/null +++ b/9.rkt @@ -0,0 +1,114 @@ +#lang curly-fn racket + +(require "scripts/aoc.rkt") + +;; solution for day 9 + +(define (cmp a b) + (cond + [(< a b) '<] + [(> a b) '>] + [else '=])) + +(define (move1 hx hy tx ty dir) + (match* (dir (cmp hx tx) (cmp hy ty)) + [("U" _ (not '>)) (values hx (add1 hy) tx ty)] + [("D" _ (not '<)) (values hx (sub1 hy) tx ty)] + [("R" (not '>) _) (values (add1 hx) hy tx ty)] + [("L" (not '<) _) (values (sub1 hx) hy tx ty)] + + [("U" '= _) (values hx (add1 hy) tx (add1 ty))] + [("U" '< _) (values hx (add1 hy) (sub1 tx) (add1 ty))] + [("U" '> _) (values hx (add1 hy) (add1 tx) (add1 ty))] + + [("D" '= _) (values hx (sub1 hy) tx (sub1 ty))] + [("D" '< _) (values hx (sub1 hy) (sub1 tx) (sub1 ty))] + [("D" '> _) (values hx (sub1 hy) (add1 tx) (sub1 ty))] + + [("R" _ '=) (values (add1 hx) hy (add1 tx) ty)] + [("R" _ '<) (values (add1 hx) hy (add1 tx) (sub1 ty))] + [("R" _ '>) (values (add1 hx) hy (add1 tx) (add1 ty))] + + [("L" _ '=) (values (sub1 hx) hy (sub1 tx) ty)] + [("L" _ '<) (values (sub1 hx) hy (sub1 tx) (sub1 ty))] + [("L" _ '>) (values (sub1 hx) hy (sub1 tx) (add1 ty))])) + +(define (part1 input) + (for*/fold ([hx 0] [hy 0] [tx 0] [ty 0] [visited (set (cons 0 0))] #:result (set-count visited)) + ([inst (in-list input)] + [dir (in-value (first inst))] + [_ (in-range (second inst))]) + (define-values [hx* hy* tx* ty*] (move1 hx hy tx ty dir)) + ; (printf "DIR: ~a | h: (~a, ~a) t: (~a ~a)\n" dir hx* hy* tx* ty*) + (values hx* hy* tx* ty* (set-add visited (cons tx* ty*))))) + +(define (apply-move dir p) + (match dir + ["U" (cons (car p) (add1 (cdr p)))] + ["D" (cons (car p) (sub1 (cdr p)))] + ["R" (cons (add1 (car p)) (cdr p))] + ["L" (cons (sub1 (car p)) (cdr p))])) + +(define (catch-up p1 p2) + (match* ((- (car p1) (car p2)) (- (cdr p1) (cdr p2))) + [(2 0) (cons (add1 (car p2)) (cdr p2))] + [(-2 0) (cons (sub1 (car p2)) (cdr p2))] + [(0 2) (cons (car p2) (add1 (cdr p2)))] + [(0 -2) (cons (car p2) (sub1 (cdr p2)))] + [(2 1) (cons (add1 (car p2)) (add1 (cdr p2)))] + [(2 -1) (cons (add1 (car p2)) (sub1 (cdr p2)))] + [(-2 1) (cons (sub1 (car p2)) (add1 (cdr p2)))] + [(-2 -1) (cons (sub1 (car p2)) (sub1 (cdr p2)))] + [(1 2) (cons (add1 (car p2)) (add1 (cdr p2)))] + [(-1 2) (cons (sub1 (car p2)) (add1 (cdr p2)))] + [(1 -2) (cons (add1 (car p2)) (sub1 (cdr p2)))] + [(-1 -2) (cons (sub1 (car p2)) (sub1 (cdr p2)))] + [(2 2) (cons (add1 (car p2)) (add1 (cdr p2)))] + [(2 -2) (cons (add1 (car p2)) (sub1 (cdr p2)))] + [(-2 2) (cons (sub1 (car p2)) (add1 (cdr p2)))] + [(-2 -2) (cons (sub1 (car p2)) (sub1 (cdr p2)))] + [(_ _) p2])) + +(define (draw state) + (define lines + (for/list ([y (in-range 10 -10 -1)]) + (apply string-append + (for/list ([x (in-range -10 10)]) + (match (index-of state (cons x y)) + [#f "."] + [0 "H"] + [i (~a i)]))))) + (string-join lines "\n")) + +(define (part2 input) + (define initial-state (build-list 10 (λ (_) (cons 0 0)))) + (for*/fold ([rope initial-state] [visited (set (cons 0 0))] #:result (set-count visited)) + ([inst (in-list input)] + [dir (in-value (first inst))] + [_ (in-range (second inst))]) + (define new-list (list (apply-move dir (first rope)))) + + (for ([i (in-range 1 10)]) + (define h (list-ref new-list (sub1 i))) + (define t (list-ref rope i)) + (define t* (catch-up h t)) + (set! new-list (append new-list (list t*)))) + + ; (printf "~a ~a\n" dir new-list) + ; (displayln (draw new-list)) + + (values new-list (set-add visited (last new-list))))) + +(define (parse fname) + (for/list ([line (in-list (file->lines fname))]) + (match-define (list dir (app string->number num)) (string-split line " ")) + (list dir num))) + +; (part2 (parse "inputs/9-test2")) +; (error "x") + +(module+ main + (define input (parse "inputs/9")) + (answer 9 1 (time (part1 input))) + (answer 9 2 (time (part2 input))) + (displayln "meow")) diff --git a/inputs/9 b/inputs/9 new file mode 100644 index 0000000..97e85a5 --- /dev/null +++ b/inputs/9 @@ -0,0 +1,2000 @@ +D 1 +L 1 +U 1 +R 2 +L 1 +U 1 +L 1 +R 2 +U 1 +D 2 +L 2 +D 1 +L 1 +R 1 +L 1 +U 1 +D 1 +R 2 +L 2 +U 1 +R 2 +L 1 +R 1 +U 2 +D 1 +R 2 +L 1 +U 2 +D 1 +R 2 +L 1 +D 1 +R 1 +U 1 +R 1 +L 1 +U 1 +L 1 +D 2 +U 1 +R 1 +D 2 +L 1 +U 1 +L 1 +U 2 +R 1 +D 2 +U 1 +R 1 +L 2 +D 1 +L 2 +R 1 +U 2 +L 1 +R 1 +L 2 +U 1 +R 1 +L 1 +U 2 +D 1 +L 1 +U 1 +R 2 +U 1 +D 1 +L 1 +R 2 +L 1 +D 1 +L 2 +R 1 +L 2 +U 2 +D 2 +U 1 +D 2 +R 2 +L 2 +R 2 +D 2 +R 1 +L 1 +U 1 +L 2 +D 2 +L 1 +U 1 +R 2 +D 2 +L 1 +U 2 +L 1 +U 2 +D 1 +R 2 +D 1 +U 2 +D 2 +L 2 +U 1 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13 +R 9 +L 14 +R 14 +L 8 +U 16 +R 13 +D 7 +R 15 +U 16 +R 3 +U 9 +R 8 +L 2 +D 3 +R 10 +D 17 +U 6 +L 10 +U 15 +L 7 +D 3 +R 2 +D 1 +R 18 +D 6 +U 9 +R 13 +D 14 +U 13 +L 13 +D 17 +R 16 +L 6 +U 8 +L 1 +R 7 +L 7 +U 13 +R 3 +D 4 +L 16 +U 15 +L 5 +U 3 +D 3 +U 12 +L 5 +D 14 +R 6 +D 3 +R 4 +L 18 +D 16 +U 12 +R 14 +U 9 +R 5 +U 19 +L 17 +R 8 +U 15 +D 9 +L 8 +D 8 +U 6 +L 4 +U 19 +D 17 +U 8 +R 19 +L 8 +U 8 +L 16 +R 6 +L 5 +U 7 +D 6 +U 10 +L 11 +D 11 +U 7 +L 6 +U 13 +D 18 +U 17 +R 11 +U 19 +D 5 +L 3 +U 6 +D 3 +U 9 +R 8 +L 7 +R 16 +L 15 +D 12 +U 10 +L 16 +R 17 +U 12 +L 1 +D 5 +L 9 +U 12 +L 2 +D 18 +L 1 +R 1 +L 2 +R 2 +L 9 +U 18 +R 8 +D 8 +R 4 +L 16 +U 6 +R 11 +D 13 +R 1 +D 14 +L 6 +D 14 +R 8 +L 5 +D 6 +L 14 +U 11 +L 5 +R 8 +D 11 +L 6 +U 17 +R 15 +L 13 +U 16 +D 2 +R 8 +D 5 +L 8 +D 7 +R 5 +U 10 +L 19 +R 7 +D 16 +R 1 +L 12 +D 8 +L 8 +R 10 +L 10 +U 1 +R 10 +U 15 diff --git a/inputs/9-test1 b/inputs/9-test1 new file mode 100644 index 0000000..9874df2 --- /dev/null +++ b/inputs/9-test1 @@ -0,0 +1,8 @@ +R 4 +U 4 +L 3 +D 1 +R 4 +D 1 +L 5 +R 2 diff --git a/inputs/9-test2 b/inputs/9-test2 new file mode 100644 index 0000000..60bd43b --- /dev/null +++ b/inputs/9-test2 @@ -0,0 +1,8 @@ +R 5 +U 8 +L 8 +D 3 +R 17 +D 10 +L 25 +U 20