60 lines
1.2 KiB
Lua
60 lines
1.2 KiB
Lua
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#!/usr/bin/env luajit
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require("utils")
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require("set")
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local file = io.open(arg[3])
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local coords = {}
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local maxr, maxc = 0, 0
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local line = file:read("*l")
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while line ~= "" do
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local c, r = unpack(split(line, ","))
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r, c = tonumber(r), tonumber(c)
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if r > maxr then maxr = r end
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if c > maxc then maxc = c end
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table.insert(coords, { r, c })
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line = file:read("*l")
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end
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local width, height = maxc + 1, maxr + 1
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foreach(coords, function(p) return p[1] * width + p[2] end)
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coords = set(coords)
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local folds = {}
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line = file:read("*l")
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while line ~= nil do
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local dir, v = unpack(split(line, "="))
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table.insert(folds, { dir == "fold along y", tonumber(v) })
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line = file:read("*l")
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end
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for i, fold in pairs(folds) do
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local dir, v = unpack(fold)
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local ncoords = set()
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for p in coords:iter() do
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local r, c = math.floor(p / width), p % width
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if dir and r > v then
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r = 2 * v - r
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elseif not dir and c > v then
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c = 2 * v - c
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end
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ncoords:add(r * width + c)
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end
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coords = ncoords
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break
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end
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for r = 0, height - 1 do
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for c = 0, width - 1 do
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if coords:has(r * width + c) then
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io.write("#")
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else
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io.write(".")
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end
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end
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io.write("\n")
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end
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io.write("\n")
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print(coords.size)
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