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java solution,
if(H==1 && W ==1) { return 4 * A.get(0).get(0) + 2; } else { int sides = 0; int top = H * W; int topSides = 0; for(int i=0;i<H;i++) { sides += A.get(i).get(0); sides += A.get(i).get(W-1); for(int j=1;j<W;j++) { topSides += Math.abs(A.get(i).get(j) - A.get(i).get(j-1)); } } for(int j=0;j<W;j++) { sides += A.get(0).get(j); sides += A.get(H-1).get(j); for(int i=1;i<H;i++) { topSides += Math.abs(A.get(i).get(j) - A.get(i-1).get(j)); } } return sides + top * 2 + topSides; }
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3D Surface Area
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java solution,