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.
Get the area codes from a list of phone numbers
vectorization in N
Derivative of polynomial
Stuff the Board
Is It a Snake?
Beads on a Necklace (Convex Hulls)
Cell Counting: How Many Draws?
When Was That Goal Scored?
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