Your test suite just checks whether a quadrilateral has equal sides, but that's not enough to form a square: rhombuses also have equal sides. Therefore, the test suite should also check a solution's angles.
PS: A test case filled with rhombuses and a single square on the curve would be instructional too.
Who Has the Most Change?
Prime factor digits
Snakes on a plane
We love vectorized solutions. Problem 1 : remove the row average.
Find the stride of the longest skip sequence
Twins in a Window
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