mirror of
https://github.com/janet-lang/janet
synced 2024-09-28 15:08:40 +00:00
6b95326d7c
remove some complexity and unexpected behavior around numbers in general as all numbers are the same number type, IEEE 754 double precision numbers. Also update examples and tests, some of which were out of date. Some more testing may be needed for new changes to numbers.
19 lines
485 B
Plaintext
19 lines
485 B
Plaintext
(defn sum3
|
|
"Solve the 3SUM problem in O(n^2) time."
|
|
[s]
|
|
(def tab @{})
|
|
(def solutions @{})
|
|
(def len (length s))
|
|
(for k 0 len
|
|
(put tab s.k k))
|
|
(for i 0 len
|
|
(for j 0 len
|
|
(def k (get tab (- 0 s.i s.j)))
|
|
(when (and k (not= k i) (not= k j) (not= i j))
|
|
(put solutions {i true j true k true} true))))
|
|
(map keys (keys solutions)))
|
|
|
|
(def arr @[2 4 1 3 8 7 -3 -1 12 -5 -8])
|
|
(print "3sum of " (string/pretty arr) ":")
|
|
(print (string/pretty (sum3 arr)))
|