There seems to be an error at 3rd test case.
Thanks for pointing that out, @Rafael S.T. Vieira. Test case 3 has been fixed.
The error was fixed in Test Case 3, but the errors seemed to still be there for the randomised cases which contains Test 3.
The other errors in the test suite mentioned by Lincoln Poon have been fixed.
How to find the position of an element in a vector without using the find function
First N Perfect Squares
Product of elements in row
Divide by 4
5th Time's a Charm
Lights Out 3 - 5x5, 6 moves
Divisible by 4
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