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
Matrix indexing with two vectors of indices
Generate a string like abbcccddddeeeee
Try 1.5.4: Celsius to Fahrenheit
Is this triangle right-angled?
interesting center of magic matrix
Which way to go?
length of string on cylinder
Recursive Standard Deviation
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