import unittest
def can_two_movies_fill_flight(xs, t):
seeking = set()
for x in xs:
if x in seeking:
return True
else:
seeking.add(t - x)
return False
# Tests
class Test(unittest.TestCase):
def test_short_flight(self):
result = can_two_movies_fill_flight([2, 4], 1)
self.assertFalse(result)
def test_long_flight(self):
result = can_two_movies_fill_flight([2, 4], 6)
self.assertTrue(result)
def test_one_movie_half_flight_length(self):
result = can_two_movies_fill_flight([3, 8], 6)
self.assertFalse(result)
def test_two_movies_half_flight_length(self):
result = can_two_movies_fill_flight([3, 8, 3], 6)
self.assertTrue(result)
def test_lots_of_possible_pairs(self):
result = can_two_movies_fill_flight([1, 2, 3, 4, 5, 6], 7)
self.assertTrue(result)
def test_not_using_first_movie(self):
result = can_two_movies_fill_flight([4, 3, 2], 5)
self.assertTrue(result)
def test_only_one_movie(self):
result = can_two_movies_fill_flight([6], 6)
self.assertFalse(result)
def test_no_movies(self):
result = can_two_movies_fill_flight([], 2)
self.assertFalse(result)
unittest.main(verbosity=2)
