| 1 | 1 | def rectangles(strings): |
| 2 | | pass |
| 2 | if not strings or not strings[0]: |
| 3 | return 0 |
| 4 | |
| 5 | rows = len(strings) |
| 6 | cols = len(strings[0]) |
| 7 | |
| 8 | # Edge Case: Single row or column |
| 9 | if rows < 2 or cols < 2: |
| 10 | return 0 |
| 11 | |
| 12 | count = 0 |
| 13 | |
| 14 | # Check all possible top-left corners |
| 15 | for i in range(rows): |
| 16 | for j in range(cols): |
| 17 | # Edge Case: Top-left corner must be '+' |
| 18 | if strings[i][j] != '+': |
| 19 | continue |
| 20 | |
| 21 | # Check all possible bottom-right corners |
| 22 | for k in range(i+1, rows): |
| 23 | for l in range(j+1, cols): |
| 24 | # Edge Case: Bottom-right corner must be '+' |
| 25 | if strings[k][l] != '+': |
| 26 | continue |
| 27 | |
| 28 | # Edge Case: Top-right corner must be '+' |
| 29 | if strings[i][l] != '+': |
| 30 | continue |
| 31 | |
| 32 | # Edge Case: Bottom-left corner must be '+' |
| 33 | if strings[k][j] != '+': |
| 34 | continue |
| 35 | |
| 36 | # Check horizontal edges |
| 37 | valid_rectangle = True |
| 38 | |
| 39 | # Edge Case: Check top edge |
| 40 | for col in range(j+1, l): |
| 41 | if strings[i][col] != '-' and strings[i][col] != '+': |
| 42 | valid_rectangle = False |
| 43 | break |
| 44 | if not valid_rectangle: |
| 45 | continue |
| 46 | |
| 47 | # Edge Case: Check bottom edge |
| 48 | for col in range(j+1, l): |
| 49 | if strings[k][col] != '-' and strings[k][col] != '+': |
| 50 | valid_rectangle = False |
| 51 | break |
| 52 | if not valid_rectangle: |
| 53 | continue |
| 54 | |
| 55 | # Edge Case: Check left edge |
| 56 | for row in range(i+1, k): |
| 57 | if strings[row][j] != '|' and strings[row][j] != '+': |
| 58 | valid_rectangle = False |
| 59 | break |
| 60 | if not valid_rectangle: |
| 61 | continue |
| 62 | |
| 63 | # Edge Case: Check right edge |
| 64 | for row in range(i+1, k): |
| 65 | if strings[row][l] != '|' and strings[row][l] != '+': |
| 66 | valid_rectangle = False |
| 67 | break |
| 68 | if not valid_rectangle: |
| 69 | continue |
| 70 | |
| 71 | count += 1 |
| 72 | |
| 73 | return count |
| 74 | # Handled Edge Cases: empty diagram, single row/column, invalid corners, invalid edges |