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.
Which values occur exactly three times?
Project Euler: Problem 1, Multiples of 3 and 5
Back to basics 23 - Triangular matrix
Fill a zeros matrix
Create a vector
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