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HomeBackend DevelopmentPython TutorialSolving the Weekly Challenge Task Ones and Zeroes in Python

Solving the Weekly Challenge  Task Ones and Zeroes in Python

1. Introduction

The Weekly Challenge, organized by Mohammad S. Anwar, is a friendly competition in which developers compete by solving a pair of tasks. It encourages participation from developers of all languages and levels through learning, sharing, and having fun.

Task 1: Ones and Zeroes from The Weekly Challenge tasks developers to find the largest subset that contains at most x zeroes and y ones.

In this post I discuss, and present my Python language solution to, Task 1: Ones and Zeroes, and wrap with a brief conclusion.

2. Task 1: Ones and Zeroes

You are given an array of binary strings, @str, and two integers, $x and $y.

Write a script to return the size of the largest subset of @str such that there are at most $x 0's and $y 1's in the subset.

A set m is a subset of n if all elements of m are also elements of n.

The Weekly Challenge 302, Task 1: Ones and Zeroes

Examples 1 and 2 present the expected outputs from given inputs.

Example 1

Input: @str = ("10", "0001", "111001", "1", "0")
       $x = 5
       $y = 3
Output: 4

The largest subset with at most five 0's and three 1's: ("10", "0001", "1", "0").

Example 2

Input: @str = ("10", "1", "0")
       $x = 1
       $y = 1
Output: 2

The largest subset with at most one 0's and one 1's: ("1", "0").

3. My solution to Task 1

from itertools import combinations

def return_subset(strs: list[list], x: int, y: int) -> int | None:
    for r in range(len(strs) - 1, 1, -1):
        subsets = combinations(strs, r)
        for subset in subsets:
            total_zeros = 0
            total_ones = 0
            for element in subset:
                total_zeros += element.count('0')
                total_ones += element.count('1')
            if total_zeros 



<p>My solution uses itertools.combinations, for loops, and if statements to find the subset that matches the task requirements:</p>

  • I use the combinations function to generate all subsets of strs with length r. I start with the maximum subset length, r = len(strs) - 1 and decrement to the smallest subset length, r = 1.
  • For each subset of length r
    • I count the total number of zeros (total_zeros) in the subset.
    • I count the total number of ones (total_ones) in the subset.
    • I return the length of subset if it matches the required conditions (total_zeros
  • If there are no subsets of strs, then I return None.

4. Conclusion

In this post I discussed Task 1: Ones and Zeroes, and I presented my solution to this task.

Learn more about the latest and past challenges at The Weekly Challenge website:
https://theweeklychallenge.org/

Learn more about competing at The Weekly Challenge FAQ:
https://theweeklychallenge.org/faq/

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