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Diffstat (limited to 'racket/aoc2015/day-25')
| -rw-r--r-- | racket/aoc2015/day-25/day-25.rkt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/racket/aoc2015/day-25/day-25.rkt b/racket/aoc2015/day-25/day-25.rkt new file mode 100644 index 0000000..975f4c3 --- /dev/null +++ b/racket/aoc2015/day-25/day-25.rkt @@ -0,0 +1,8 @@ +#lang racket + +(define max-r 2978) +(define max-c 3083) + +(for/fold ([code 20151125] [r 1] [c 1]) ([i (in-naturals)] #:break (and (= max-r r) (= max-c c))) + (define new-code (modulo (* code 252533) 33554393)) + (if (= r 1) (values new-code (add1 c) 1) (values new-code (sub1 r) (add1 c)))) |