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.
Find out missing number from a vector of 9 elements
Insert zeros into vector
Basic arrays operations.
Implement a bubble sort technique and output the number of swaps required
Crossing to Kissing - Untangle the Lines
Generate a melodic contour string matrix
Find the stride of the longest skip sequence
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