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.
Technically, this problem is actually requesting the number of unique intersections minus one. For instance in the first case of the test suite, the line crosses the point (5,3) which is shared by four squares, but we count only two, which is the expected behaviour when crossing an edge, but not a vertex: https://imgur.com/a/wCQ6SNG
Back and Forth Rows
Find all elements less than 0 or greater than 10 and replace them with NaN
Return unique values without sorting
Getting the indices from a matrice
03 - Matrix Variables 6
rectangle in circle
Which way to go?
Number of divisors of a given number
How many rectangles in a grid ?
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