Overlapping discs

You are given n discs on plane, of the same radius (r=1). Output the area of the part of the plane which is covered by each disc. Input First, 1tnn pairs of floating point coordinates follow: -1000xi,yi, representing the location of the i-th disc. Output For each testcase, output the total area covered by the intersection of all discs. Round the answer to 6 decimal digits after the point. Exa