tasks a-s

2013-04-10 23:57:08 -07:00 · 2013-04-10 23:57:08 -07:00 · b83f433714
commit b83f433714
parent 47bf37c096
12433 changed files with 156208 additions and 123 deletions
--- a/Task/Permutations/Lua/permutations.lua
+++ b/Task/Permutations/Lua/permutations.lua
@ -0,0 +1,17 @@
+local function permutation(a, n, cb)
+	if n == 0 then
+		cb(a)
+	else
+		for i = 1, n do
+			a[i], a[n] = a[n], a[i]
+			permutation(a, n - 1, cb)
+			a[i], a[n] = a[n], a[i]
+		end
+	end
+end
+
+--Usage
+local function callback(a)
+	print('{'..table.concat(a, ', ')..'}')
+end
+permutation({1,2,3}, 3, callback)