Given a line defined by (x1,y1) & (x2,y2),return the number of squares that the line crosses on the grid (a square is 1x1).
Coming next: return the number of squares for any geometrical shape
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.
Specific Element Count
Return unique values without sorting
Slicing the cube
How many rectangles in a grid ?
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