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authorHunky Jimpjorps <thechairman@thechairman.info>2024-02-02 17:24:30 -0500
committerHunky Jimpjorps <thechairman@thechairman.info>2024-02-02 17:24:30 -0500
commit547fe03cf43105f46160e2dd9afff21637eaaf47 (patch)
tree8010032bf495ad120a4d586a7a96ebc9139e3f32
parent48e35ad3b0b0c62f936784e4aca70b17c3b0e3f9 (diff)
downloadgleam_aoc-547fe03cf43105f46160e2dd9afff21637eaaf47.tar.gz
gleam_aoc-547fe03cf43105f46160e2dd9afff21637eaaf47.zip
2018, day 1 complete
-rw-r--r--aoc2018/day-01/day-01.rkt16
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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))