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#!/usr/bin/env lua
local function has_dups(n)
assert(type(n) == 'number','n must be a number!')
if n > 9999999999 then return true end
local hash = {}
while n ~= 0 do
if(hash[n%10] ~= nil) then return true end
hash[n%10] = 1
n = n // 10
end
return false
end
local function special_integers(n)
assert(type(n) == 'number','n must be a number!')
local count = 0
for i=1, n do
if not has_dups(i) then count = count + 1 end
end
return count
end
print(special_integers(15))
print(special_integers(35))
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