Bug: The order of the arguments in the starting function definition is x1, x2, y1, y2, whereas the the order in the test cases is x1, y1, x2, y2.
Back to basics 11 - Max Integer
Back to basics 21 - Matrix replicating
07 - Common functions and indexing 4
How many rectangles in a grid ?
length of string on cylinder
Number of divisors of a given number
Speed of light:Experiment
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