[p2] cleanup

p2/p2.org

@@ -1,6 +1,6 @@
 #+title: Solution to p2
 
-First load the data as a list of cons cells (stsrt . end)
+First load the data as a list of cons cells (start . end)
 #+begin_src emacs-lisp :results none
   (with-temp-buffer
     (insert-file-contents "input")
@@ -23,15 +23,18 @@ This is for part 1; only two repetitions
 
   (defun invalid-id-p (num)
     (let* ((num-digits (1+ (floor (log num 10))))
-           (factor (expt 10 (floor (/ num-digits 2)))))
-      (= (mod num factor) (/ num factor))))
+           (mult (expt 10 (floor (/ num-digits 2)))))
+      (= (mod num mult) (/ num mult))))
 
   (-sum
-   (apply #'append
-          (--map (-filter #'invalid-id-p it) (-map #'create-range data))))
+   (--mapcat (-filter #'invalid-id-p it)
+  	   (-map #'create-range data)))
 #+end_src
 
 #+RESULTS:
+: 1227775554
+
+rsjjdj
 : 24157613387
 
 This is for part 2: very inefficient, but it works
@@ -51,9 +54,9 @@ This is for part 2: very inefficient, but it works
              (-map #'-distinct (--map (chop-num num it) factors)))))
 
     (-sum
-     (apply #'append
-            (--map (-filter #'invalid-id-p it) (-map #'create-range data))))
+     (--mapcat (-filter #'invalid-id-p it)
+  	     (-map #'create-range data)))
 #+end_src
 
 #+RESULTS:
-: 33832678380
+: 4174379265