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  1. Prepare
  2. Algorithms
  3. Implementation
  4. 3D Surface Area
  5. Discussions

3D Surface Area

  • anarod_val25
     + 0 comments

    C++

    int surfaceArea(vector<vector<int>> A) {
   int H = A.size();
    int W = A[0].size();
    int area = 0;
    
    for (int i = 0; i < H; i++) {
        for (int j = 0; j < W; j++) {
            if (A[i][j] > 0) {
                area += 2;
                
                area += max(A[i][j] - (i > 0 ? A[i-1][j] : 0), 0);
                area += max(A[i][j] - (i < H-1 ? A[i+1][j] : 0), 0);
                area += max(A[i][j] - (j > 0 ? A[i][j-1] : 0), 0);
                area += max(A[i][j] - (j < W-1 ? A[i][j+1] : 0), 0);
            }
        }
    }
    
    return area;
}