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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 /aoc2018/day-01/day-01.rkt
parent6156a9ef7be4012063a042aafb4e9b0d7eadde8e (diff)
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diff --git a/aoc2018/day-01/day-01.rkt b/aoc2018/day-01/day-01.rkt
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-#lang racket
-
-(require advent-of-code
- threading)
-
-(define deltas
- (~>> (open-aoc-input (find-session) 2018 1 #:cache #true) port->lines (map string->number)))
-
-;; part 1
-(for/sum ([delta deltas]) delta)
-
-;; part 2
-(for/fold ([seen (set)] [current-frequency 0] #:result current-frequency) ([delta (in-cycle deltas)])
- (define new-frequency (+ current-frequency delta))
- #:final (set-member? seen new-frequency)
- (values (set-add seen new-frequency) new-frequency))