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]
"""
def countBits(num: int) -> List[int]:
res = [0]
while len(res) <= num:
for i in res[:num+1 - len(res)]: # :8 - 7- 6 -5 1
res += [i + 1]
return res

Which of the following examples has four beats in each measure?

Acase study allows a more detailed look at the life of a single subject than any other study.

File account.java (see previous exercise) contains a definition for a simple bank account class with methods to withdraw, deposit, get the balance and account number, and return a string representation. note that the constructor for this class creates a random account number. save this class to your directory and study it to see how it works. then write the following additional code: 1. suppose the bank wants to keep track of how many accounts exist. a. declare a private static integer variable numaccounts to hold this value. like all instance and static variables, it will be initialized (to 0, since it’s an int) automatically. b. add code to the constructor to increment this variable every time an account is created. c. add a static method getnumaccounts that returns the total number of accounts. think about why this method should be static - its information is not related to any particular account. d. file testaccounts1.java contains a simple program that creates the specified number of bank accounts then uses the getnumaccounts method to find how many accounts were created. save it to your directory, then use it to test your modified account class.