diff -r c81a4bca6e78 -r 3629dbe4d8ff src/problems.lisp
--- a/src/problems.lisp Mon Sep 25 20:11:11 2017 -0400
+++ b/src/problems.lisp Mon Sep 25 20:14:29 2017 -0400
@@ -1718,6 +1718,13 @@
;; given above.
(iterate
(for line-number :from 1)
+ ;; Lisp can compute the exponents, but it takes a really long time. We can
+ ;; avoid having to compute the full values using:
+ ;;
+ ;; log(base^expt) = expt * log(base)
+ ;;
+ ;; Taking the log of each number preserves their ordering, so we can compare
+ ;; the results and still be correct.
(for (base exponent) :in-csv-file "data/099-exponents.txt"
:key #'parse-integer)
(finding line-number :maximizing (* exponent (log base)))))