d4d8397e5f
Adds some of the code I generated while studying for a role transfer at Google using the fantastic resource, InterviewCake.com. This work predates the mono-repo. I should think of ways to DRY up this code and the code in crack_the_coding_interview, but I'm afraid I'm creating unnecessary work for myself that way.
94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
import unittest
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################################################################################
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# Solution
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################################################################################
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# do_merge_ranges :: [(Int, Int)] -> [(Int, Int)] -> [(Int, Int)]
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def do_merge_ranges(prev, xs):
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if len(xs) == 0:
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return prev
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elif len(xs) == 1:
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return prev + xs
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else:
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a1, a2 = xs[0]
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b1, b2 = xs[1]
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rest = xs[2:]
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if b1 <= a2:
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return do_merge_ranges(prev, [(a1, max(a2, b2))] + rest)
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else:
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return do_merge_ranges(prev + [(a1, a2)], [(b1, b2)] + rest)
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# merge_ranges :: [(Int, Int)] -> [(Int, Int)]
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def merge_ranges(xs):
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xs = xs[:]
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xs.sort()
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return do_merge_ranges([], xs)
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# merge_ranges_b :: [(Int, Int)] -> [(Int, Int)]
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def merge_ranges_b(xs):
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fi = 0
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ci = 1
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result = []
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xs = xs[:]
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xs.sort()
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while ci < len(xs):
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while ci < len(xs) and xs[ci][0] <= xs[fi][1]:
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xs[fi] = xs[fi][0], max(xs[ci][1], xs[fi][1])
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ci += 1
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result.append(xs[fi])
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fi = ci
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ci += 1
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if fi < len(xs):
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result.append(xs[fi])
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return result
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################################################################################
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# Tests
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################################################################################
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class Test(unittest.TestCase):
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def test_meetings_overlap(self):
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actual = merge_ranges([(1, 3), (2, 4)])
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expected = [(1, 4)]
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self.assertEqual(actual, expected)
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def test_meetings_touch(self):
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actual = merge_ranges([(5, 6), (6, 8)])
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expected = [(5, 8)]
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self.assertEqual(actual, expected)
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def test_meeting_contains_other_meeting(self):
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actual = merge_ranges([(1, 8), (2, 5)])
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expected = [(1, 8)]
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self.assertEqual(actual, expected)
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def test_meetings_stay_separate(self):
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actual = merge_ranges([(1, 3), (4, 8)])
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expected = [(1, 3), (4, 8)]
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self.assertEqual(actual, expected)
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def test_multiple_merged_meetings(self):
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actual = merge_ranges([(1, 4), (2, 5), (5, 8)])
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expected = [(1, 8)]
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self.assertEqual(actual, expected)
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def test_meetings_not_sorted(self):
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actual = merge_ranges([(5, 8), (1, 4), (6, 8)])
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expected = [(1, 4), (5, 8)]
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self.assertEqual(actual, expected)
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def test_one_long_meeting_contains_smaller_meetings(self):
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actual = merge_ranges([(1, 10), (2, 5), (6, 8), (9, 10), (10, 12)])
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expected = [(1, 12)]
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self.assertEqual(actual, expected)
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def test_sample_input(self):
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actual = merge_ranges([(0, 1), (3, 5), (4, 8), (10, 12), (9, 10)])
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expected = [(0, 1), (3, 8), (9, 12)]
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self.assertEqual(actual, expected)
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unittest.main(verbosity=2)
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