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authorH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
committerH.J <thechairman@thechairman.info>2024-10-09 11:36:55 -0400
commit8777ff071f7bb37631baa7b6717ad29961e50911 (patch)
tree6d59c4ed58e454b960339c3d1151f0a879e8d7cb /leetcode/lc-1436-destination-city.rkt
parent6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff)
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-rw-r--r--leetcode/lc-1436-destination-city.rkt14
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diff --git a/leetcode/lc-1436-destination-city.rkt b/leetcode/lc-1436-destination-city.rkt
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-#lang racket
-(define/contract (dest-city paths)
- (-> (listof (listof string?)) string?)
- (define city-pairs (make-hash paths))
- (define (go-to-next-city origin)
- (let ([destination (hash-ref city-pairs origin #false)])
- (if destination
- (go-to-next-city (car destination))
- origin)))
- (go-to-next-city (caar paths)))
-
-(dest-city '(("London" "New York")
- ("New York" "Lima")
- ("Lima" "Sao Paolo"))) \ No newline at end of file