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Help the bots calculate the total price of all the rooms that are suitable for them.
Example
For
matrix = [[0, 1, 1, 2],
[0, 5, 0, 0],
[2, 0, 3, 3]]
the output should be
matrixElementsSum(matrix) = 9.
Here's the rooms matrix with unsuitable rooms marked with 'x':
[[x, 1, 1, 2],
[x, 5, x, x],
[x, x, x, x]]
Thus, the answer is 1 + 5 + 1 + 2 = 9.
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