The given code defines two lambda functions, `g` and another...

March 29, 2023 at 08:34 AM

lambda s:g([int("0"+s,2)],len(s)) g=lambda l,n:min(l)and-~g([x^(1<<n+j)/-~(1<<i)%(1<<n)for i in range(1,n+1)for j in range(i*2)for x in l],n)

The given code defines two lambda functions, g and another unnamed function.

The unnamed function takes a binary string s, pads a '0' at the beginning to ensure that it has length multiple of 8 (a byte), converts the resulting string to an integer using base-2 (binary) representation, and stores it as a single-element list [int("0"+s,2)]. It then calls g with this list and the length of the original string as arguments.

The g function takes a list l of integers and an integer n as input. It first checks if the minimum value in the list is non-zero (i.e., not False or None or 0). If it is zero, the function returns 0.

If the smallest value in l is non-zero, the function performs the following operations:

  • for each index i from 1 to n, and for each index j from 0 to 2*i-1, it computes a new integer by flipping the j-th bit of the i-th integer in l.
  • for each such new integer, it XORs it with (1 << n+j) / (1 << i+1) % (1 << n) and appends the result to a new list.
  • the function then recursively calls itself with the new list and the same value of n, incrementing the result by 1 each time, until the minimum value in the new list is zero.

The purpose and output of this code are unclear without additional context.

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