49 lines
1.1 KiB
Lua
49 lines
1.1 KiB
Lua
function readline()
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local x1 = io.read("*n")
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io.read(1) -- ","
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local y1 = io.read("*n")
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io.read(4) -- " -> "
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local x2 = io.read("*n")
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io.read(1) -- ","
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local y2 = io.read("*n")
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io.read("*l") -- "...\n"
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return x1, y1, x2, y2
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end
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function mark(field, x, y, count, dx, dy)
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local i = 0
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while i <= count do
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local row = field[x+i*dx] or {}
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row[y+i*dy] = (row[y+i*dy] or 0) + 1
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field[x+i*dx] = row
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i = i + 1
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end
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end
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io.input(arg[3])
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local x1, y1, x2, y2 = readline()
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local field = {}
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while x1 ~= nil do
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local x, y, count, dx, dy
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if x1 == x2 then
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mark(field, x1, math.min(y1, y2), math.abs(y1 - y2), 0, 1)
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elseif y1 == y2 then
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mark(field, math.min(x1, x2), y1, math.abs(x2 - x1), 1, 0)
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elseif x1 + y1 == x2 + y2 then
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mark(field, math.min(x1, x2), math.max(y1, y2), math.abs(x1 - x2), 1, -1)
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else
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mark(field, math.min(x1, x2), math.min(y1, y2), math.abs(x1 - x2), 1, 1)
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end
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x1, y1, x2, y2 = readline()
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end
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local count = 0
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for r, row in pairs(field) do
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for c, col in pairs(row) do
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if col >= 2 then
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count = count + 1
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end
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end
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end
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print(count)
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