diff options
| -rw-r--r-- | 2022/day-12/day-12.rkt | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/2022/day-12/day-12.rkt b/2022/day-12/day-12.rkt index ed93453..c3f01ac 100644 --- a/2022/day-12/day-12.rkt +++ b/2022/day-12/day-12.rkt @@ -23,16 +23,16 @@ (for*/list ([dx (in-list '(-1 0 1))] [dy (in-list '(-1 0 1))] #:when (= 1 (abs (+ dx dy))) - #:do [(define p (cons (+ x dx) (+ y dy)))] - #:when (hash-has-key? terrain-mesh p)) - p)) + #:do [(define p* (cons (+ x dx) (+ y dy)))] + #:when (hash-has-key? terrain-mesh p*)) + p*)) (define paths (directed-graph (for*/list ([p (in-list (hash-keys terrain-mesh))] - [neighbor (in-list (neighbors p))] - #:unless (> (sub1 (hash-ref terrain-mesh neighbor)) + [p* (in-list (neighbors p))] + #:unless (> (sub1 (hash-ref terrain-mesh p*)) (hash-ref terrain-mesh p))) - (list p neighbor)))) + (list p p*)))) ;; part 1 (time (match-define-values (distances _) (bfs paths (hash-ref special-points 'start))) |