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python-csi160/midterm/part9.py

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+'''
+Do not use AI! You can schedule to try again if you have a bad grade!
+Write a functon named 'above_main_diagonal' which receives a square matrix as parameter and returns the sum of the
+elements above the main diagonal. The main diagonal is the one that goes from the top-left to the bottom-right of the
+matrix. A number is characterized as above the main diagonal if its row index is less than its column index. The matrix
+will always have at least one element.
+
+Example:
+matrix = [[1, 1, 1],
+          [1, 1, 1],
+          [1, 1, 1]]
+print(above_main_diagonal(matrix))  # Output: 3. It will sum 1+1+1
+
+matrix = [[1,  2,  3,  4],
+          [5,  6,  7,  8],
+          [9,  10, 11, 12],
+          [13, 14, 15, 16]]
+print(above_main_diagonal(matrix))  # Output: 36. It will sum 2+3+4+7+8+12
+'''
+def above_main_diagonal(matrix):
+    sum = 0
+    for row in range(len(matrix)):
+        for col in range(len(matrix[0])):
+            if row < col:
+                sum += matrix[row][col]
+    return sum
+
+
+matrix = [[1, 1, 1],
+          [1, 1, 1],
+          [1, 1, 1]]
+print(above_main_diagonal(matrix))  # Output: 3. It will sum 1+1+1
+
+matrix = [[1,  2,  3,  4],
+          [5,  6,  7,  8],
+          [9,  10, 11, 12],
+          [13, 14, 15, 16]]
+print(above_main_diagonal(matrix))  # Output: 36. It will sum 2+3+4+7+8+12