diff --git a/2020/05.rkt b/2020/05.rkt new file mode 100644 index 0000000..83f6dcd --- /dev/null +++ b/2020/05.rkt @@ -0,0 +1,18 @@ +#lang br +(require racket/file srfi/13 rackunit) + +(define (seat-id seat) + (for/sum ([(c i) (in-indexed (string-reverse seat))] + #:when (memv c '(#\R #\B))) + (arithmetic-shift 1 i))) + +(define seat-ids (map seat-id (file->lines "05.rktd"))) + +(check-equal? (apply max seat-ids) 915) + +(check-equal? + (for/first ([first (sort seat-ids <)] + [second (cdr (sort seat-ids <))] + #:when (= 2 (- second first))) + (sub1 second)) + 699) \ No newline at end of file diff --git a/2020/05.rktd b/2020/05.rktd new file mode 100644 index 0000000..34edaca --- /dev/null +++ b/2020/05.rktd @@ -0,0 +1,869 @@ +FFFFBBBRLR +BFBBFBFRRR +FFBFBBFRRL +BFBFBBFRRR +BFBBFFFLLR +FFFBFFFRRL +BFFBFFFLLL +BFFBFFFRRL +FFBBFBBLRR +BBFBBFBLLL +BFFFFBFRRL +BFFFBFBLLR +BBFFBFFRLR +BFBFBBFLLR +BBFBFBFRLR +BBFFBFFRRL +FBFFFBFLRL +BFFFBBFLLL +FBFFFFFLLR +FBFFFBFLRR +BFBFBFBLLR +BFBBBFFRLR +FBBBFFFLRR +BBBFFFFLRL +FBBFFFFLRR +BFFFBFBRLL +BFBBBBBLLL +BBFBFBFRLL +FFBFBBBRRR +FBBBFBBLRL +BFFBFBFRRR +BBFFBFBRLR +FBFFFFBRRR +FBFBBFBLRR +BBBFFFBLLL +FBFFBBFLLL +FBFBBBBLRL +BFBFBFBLRL +BFBFFBFLLL +FBBBBFFRRR +BFBFFBBRLL +FFBFBBFLRL +BFBBBFFLLR +FBFFBBBLRL +BFBBBFFRRR +FFFBFBBLLR +FFBBFFBRLL +BFFBBFBRLL +BFBBFBBLRR +BFFFFBBRRL +FFFBBFFLLR +FBFBBFFLRL +FFFBFBBRLL +FBBBFBFLRL +BFFFBBBRLL 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