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.
Reverse Run-Length Encoder
Counting in Finnish
Create matrix of replicated elements
MatCAT - Reconstruct X from Its X-rays
Simulate one complete step in the Biham–Middleton–Levine traffic model
Put two time series onto the same time basis
Would Homer Like It?
Find the biggest empty box
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