5c9079a410
Manually merging: - README.md: I added the description from universe/README.md into the heading of dotfiles/README.md. - .envrc: dotfiles/.envrc was a superset of universe/.envrc - .gitignore: Adding some of the ignored patterns from universe/.gitignore to dotfiles/.gitignore Everything else here should be a simple rename.
61 lines
1.7 KiB
Python
61 lines
1.7 KiB
Python
from math import floor
|
|
import unittest
|
|
|
|
|
|
################################################################################
|
|
# Solution
|
|
################################################################################
|
|
def bounds(r):
|
|
ct = len(r)
|
|
if ct % 2 == 0:
|
|
h = int(ct / 2)
|
|
return ct, h
|
|
else:
|
|
h = floor(ct / 2)
|
|
return ct, h
|
|
|
|
|
|
def find_repeat(xs):
|
|
ct, h = bounds(xs)
|
|
rl = range(1, h + 1)
|
|
rr = range(h + 1, ct)
|
|
while True:
|
|
nl = len([None for x in xs if x in rl])
|
|
nr = len([None for x in xs if x in rr])
|
|
branch = rl if nl > nr else rr
|
|
if len(branch) == 1:
|
|
return branch[0]
|
|
ct, h = bounds(branch)
|
|
rl = range(branch[0], branch[0])
|
|
rr = range(branch[0] + h, branch[-1] + 1)
|
|
raise Exception(
|
|
'We could not find any duplicates in xs. Perhaps xs did not adhere to the usage contract.'
|
|
)
|
|
|
|
|
|
################################################################################
|
|
# Tests
|
|
################################################################################
|
|
class Test(unittest.TestCase):
|
|
def test_just_the_repeated_number(self):
|
|
actual = find_repeat([1, 1])
|
|
expected = 1
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_short_list(self):
|
|
actual = find_repeat([1, 2, 3, 2])
|
|
expected = 2
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_medium_list(self):
|
|
actual = find_repeat([1, 2, 5, 5, 5, 5])
|
|
expected = 5
|
|
self.assertEqual(actual, expected)
|
|
|
|
def test_long_list(self):
|
|
actual = find_repeat([4, 1, 4, 8, 3, 2, 7, 6, 5])
|
|
expected = 4
|
|
self.assertEqual(actual, expected)
|
|
|
|
|
|
unittest.main(verbosity=2)
|