2020: day 4, 6, 7

1 files changed, 22 insertions, 0 deletions

diff --git a/2020/day-06/day-06.rkt b/2020/day-06/day-06.rkt
new file mode 100644
index 0000000..b0e2af9
--- /dev/null
+++ b/2020/day-06/day-06.rkt
@@ -0,0 +1,22 @@
+#lang racket
+(require "../../jj-aoc.rkt"
+         threading)
+
+(define responses (~> (open-day 6 2020) (port->string) (string-split "\n\n")))
+
+;; part 1
+(define (response-count-total rs)
+  (for/sum ([r (in-list rs)]) (~> r (string-replace _ "\n" "") string->list list->set set-count)))
+
+(response-count-total responses)
+
+;; part 2
+(define (response-consensus-total rs)
+  (for/sum ([r (in-list rs)])
+           (~> r
+               (string-split _ "\n")
+               (map (λ~> string->list list->set) _)
+               (apply set-intersect _)
+               set-count)))
+
+(response-consensus-total responses)
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