019f8fd211
git-subtree-dir: users/wpcarro git-subtree-mainline:464bbcb15cgit-subtree-split:24f5a642afChange-Id: I6105b3762b79126b3488359c95978cadb3efa789
47 lines
1,000 B
Python
47 lines
1,000 B
Python
from math import floor
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def find_rotation(xs):
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if xs[0] < xs[-1]:
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return xs[0]
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beg, end = 0, len(xs) - 1
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found = False
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count = 10
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while not found and count >= 0:
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i = beg + floor((end - beg) / 2)
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if xs[beg] < xs[i]:
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beg = i
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i = beg + floor((end - beg) / 2)
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elif xs[beg] > xs[i]:
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end = i
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found = xs[i - 1] > xs[i]
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count -= 1
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return xs[i]
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xs = [(['ptolemaic',
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'retrograde',
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'supplant',
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'undulate',
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'xenoepist',
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'zebra',
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'asymptote',
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'babka',
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'banoffee',
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'engender',
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'karpatka',
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'othellolagkage',
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], "asymptote"),
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(['asymptote',
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'babka',
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'banoffee',
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'engender',
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'karpatka',
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'othellolagkage',
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], "asymptote"),
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]
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for x, expected in xs:
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result = find_rotation(x)
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print(x, result)
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assert result == expected
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print("Success!")
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