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Diffstat (limited to 'leetcode/lc-1037-boomerang.rkt')
| -rw-r--r-- | leetcode/lc-1037-boomerang.rkt | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/leetcode/lc-1037-boomerang.rkt b/leetcode/lc-1037-boomerang.rkt deleted file mode 100644 index fd95695..0000000 --- a/leetcode/lc-1037-boomerang.rkt +++ /dev/null @@ -1,21 +0,0 @@ -#lang racket -(define/contract (is-boomerang points) - (-> (listof (listof exact-integer?)) boolean?) - (match points - [(list-no-order a b c) #:when (equal? a b) #false] ; Are any two points the same? - [(list (list x _) (list x _) (list x _)) #false] ; Are they on a horizontal line? - [(list (list _ y) (list _ y) (list _ y)) #false] ; Are they on a vertical line? - [(list-no-order (list x1 _) (list x2 _) (list x3 _)) ; Are two points on a horizontal line, - #:when (and (= x1 x2) ; but the third point isn't? - (not (= x1 x3))) #true] - [(list-no-order (list _ y1) (list _ y2) (list _ y3)) ; Are two points on a vertical line, - #:when (and (= y1 y2) ; but the third point isn't? - (not (= y1 y3))) #true] - [(list (list x1 y1) (list x2 y2) (list x3 y3)) ; If none of the special cases apply, - (let ([m (/ (- y2 y1) (- x2 x1))]) ; calculate the slope between two points - (not (= y3 (+ y1 (* m (- x3 x1))))))])) ; and see if the line passes through the third - -(is-boomerang '((1 1) (2 3) (3 2))) -(is-boomerang '((1 1) (2 2) (3 3))) -(is-boomerang '((0 0) (0 2) (2 1))) -(is-boomerang '((0 0) (1 1) (1 1)))
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