function Factorial(Number)
return (Number == 0 and 1) or (Number * Factorial(Number - 1))
end
function Permute(String)
local Length = #String
local TotalPermutes = Factorial(Length)
local Permutations = {}
for Index = 1, TotalPermutes do
print(Index)
table.insert(Permutations, String)
local Index2 = Length - 1
while String:sub(Index2, Index2) >= String:sub(Index2 + 1, Index2 + 1) do
Index2 = Index2 - 1
end
local Length2 = Length
while String:sub(Index2, Index2) >= String:sub(Length2, Length2) do
Length2 = Length2 - 1
end
String = SwapCharacters(String, Index2, Length2)
String = ReverseSubstring(String, Index2 + 1)
end
return Permutations
end
function SwapCharacters(String, Index, Index2)
local Characters = {}
for Character in String:gmatch(".") do
table.insert(Characters, Character)
end
Characters[Index], Characters[Index2] = Characters[Index2], Characters[Index]
return table.concat(Characters)
end
function ReverseSubstring(String, Start)
local Characters = {}
for Character in String:gmatch(".") do
table.insert(Characters, Character)
end
local Index = Start
local Index2 = #Characters
while Index < Index2 do
Characters[Index], Characters[Index2] = Characters[Index2], Characters[Index]
Index = Index + 1
Index2 = Index2 - 1
end
return table.concat(Characters)
end
local String = ""
local Permutations = Permute("wow")
for _, Permute in next, Permutations do
print(Permute)
end
