Computers and Technology, 30.05.2020 02:01 totie7496
Programming question: Given a number, eg. 8, try to calculate and output a list/array of
that in each number's binary form - how many '1' in each number? (should not use string. count('1') in the Python. Efficiency is most important!)
Example: number is 8.
Expected output is - [0, 1, 1, 2, 1, 2, 2, 3, 1]
See some good code snippet (listed below), but not quite understand it? Can you help explain?
```code:
from typing import List
def countBits(num: int) -> List[int]:
""" count all numbers: from 0 to num (eg. 8)
-each number's binary bit in '1':
>>> countBits(8)
[0, 1, 1, 2, 1, 2, 2, 3, 1]
"""
res = [0]
while len(res) <= num:
for i in res[:num+1 - len(res)]: # :8 - 7- 6 -5 1
res += [i + 1]
return res
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Programming question: Given a number, eg. 8, try to calculate and output a list/array of
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