Do They Intersect? X52569

Statement

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Let a, b, c, d be integers such that a≤ b and c≤ d. Write a function do_they_intersect(a, b, c, d) that tells us whether the open intervals (a, b) and (c, d) have a nonempty intersection.

Observation

Only the function will be evaluated. If your submission includes a main program (e.g. with testmod), it must be either commented out or inside a condition if __name__ == ’__main__’

Sample session

>>> do_they_intersect(1, 5, 3, 7)
True
>>> do_they_intersect(10, 15, 1, 5)
False
>>> do_they_intersect(3, 5, 2, 11)
True
>>> do_they_intersect(1, 4, 4, 5)
False
>>> do_they_intersect(10, 10, 9, 11)
False
>>> not do_they_intersect(2, 3, 1, 2)
True

Information

Author: Jordi Delgado and José Luis Balcázar
Language: English
Official solutions: Python
User solutions: Python