Payam, this is a good puzzle, but the code in the template and the test suite gives away the answer. I suggest removing the code from the template and checking the validity of the answer by applying the rules to rows, columns, and 3x3 squares.
First N Perfect Squares
Generate a vector like 1,2,2,3,3,3,4,4,4,4
07 - Common functions and indexing 5
Is this triangle right-angled?
speed limit alert
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