20 lines
471 B
Lua
20 lines
471 B
Lua
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--returns an iterator over the first n copies of the look-and-say sequence
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function lookandsayseq(n)
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local t = {1}
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return function()
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local ret = {}
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for i, v in ipairs(t) do
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if t[i-1] and v == t[i-1] then
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ret[#ret - 1] = ret[#ret - 1] + 1
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else
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ret[#ret + 1] = 1
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ret[#ret + 1] = v
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end
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end
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t = ret
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n = n - 1
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if n > 0 then return table.concat(ret) end
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end
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end
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for i in lookandsayseq(10) do print(i) end
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