def test6(self):
intervals = [[2,4],[1,2],[4,5]]
res = answer2_2(intervals)
self.assertEqual(res, 4)
def test3(self):
intervals = [[1,2],[2,2**30-1]]
res = answer2_2(intervals)
self.assertEqual(res, 2**30-2)
def test5(self):
intervals = [[1,2],[4,5]]
res = answer2_2(intervals)
self.assertEqual(res, 2)
def test1(self):
intervals = [[1,2],]
res = answer2_2(intervals)
self.assertEqual(res, 1)
