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var computeArea = function (A, B, C, D, E, F, G, H) {
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  var intersectionWidth = Math.min(C, G) - Math.max(A, E);
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  var intersectionHeight = Math.min(D, H) - Math.max(B, F);
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  intersectionWidth = intersectionWidth > 0 ? intersectionWidth : 0;
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  intersectionHeight = intersectionHeight > 0 ? intersectionHeight : 0;
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  return (
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    (C - A) * (D - B) +
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    (G - E) * (H - F) -
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    intersectionWidth * intersectionHeight
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  );
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};