Not sure why the problem title says "3x3 matrix", then uses non-3x3 matrices in the example and test suite. Considering rewording for clarity.
The problem description has been updated and new test cases are added.
Works only because of limited test suite.
Determine if a Given Number is a Triangle Number
Deleting an element in a matrix
Replace every 3rd element in a vector with 4
Divisible by 10
Summation of array
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