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authorHJ <thechairman@thechairman.info>2023-01-17 12:46:04 -0500
committerHJ <thechairman@thechairman.info>2023-01-17 12:46:04 -0500
commitfafbeaf9e3c09ba7a5bea7e47d5736001f8a5aa1 (patch)
treed586a28650cbbfb20ece931a85bcce4c29e5e40b /leetcode/lc-896-monotonic-array.rkt
parentbc5387512ba529072338648d6337ddab731b8b8c (diff)
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adding old leetcode solutions
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1 files changed, 16 insertions, 0 deletions
diff --git a/leetcode/lc-896-monotonic-array.rkt b/leetcode/lc-896-monotonic-array.rkt
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+#lang racket
+(define/contract (is-monotonic test-list)
+ (-> (listof exact-integer?) boolean?)
+ (cond [(empty? (cdr test-list)) #true]
+ [((car test-list) . > . (cadr test-list))
+ (is-monotonic-direction test-list >=)]
+ [((car test-list) . < . (cadr test-list))
+ (is-monotonic-direction test-list <=)]
+ [else (is-monotonic (cdr test-list))]))
+
+(define/contract (is-monotonic-direction test-list dir)
+ (-> (listof exact-integer?) procedure? boolean?)
+ (cond [(empty? (cdr test-list)) #true]
+ [((car test-list) . dir . (cadr test-list))
+ (is-monotonic-direction (cdr test-list) dir)]
+ [else #false])) \ No newline at end of file