• Home
  • Subscribe
  • Contribute Us
    • Share Your Interview Experience
  • Contact Us
  • About
    • About CSEstack
    • Campus Ambassador
  • Forum & Discus
  • Tools for Geek
  • LeaderBoard
CSEstack

What do you want to Learn Today?

  • Programming
    • Tutorial- C/C++
    • Tutorial- Django
    • Tutorial- Git
    • Tutorial- HTML & CSS
    • Tutorial- Java
    • Tutorial- MySQL
    • Tutorial- Python
    • Competitive Coding Challenges
  • CSE Subject
    • (CD) Compiler Design
    • (CN) Computer Network
    • (COA) Computer Organization & Architecture
    • (DBMS) Database Management System
    • (DS) Data Structure
    • (OS) Operating System
    • (ToA) Theory of Automata
    • (WT) Web Technology
  • Interview Questions
    • Interview Questions- Company Wise
    • Interview Questions- Coding Round
    • Interview Questions- Python
    • Interview Questions- REST API
    • Interview Questions- Web Scraping
    • Interview Questions- HR Round
    • Aptitude Preparation Guide
  • GATE 2022
  • Linux
  • Trend
    • Full Stack Development
    • Artificial Intelligence (AI)
    • BigData
    • Cloud Computing
    • Machine Learning (ML)
  • Write for Us
    • Submit Article
    • Submit Source Code or Program
    • Share Your Interview Experience
  • Tools
    • IDE
    • CV Builder
    • Other Tools …
  • Jobs

Ordering Task/Packages from Given Dependencies | Python Coding Challenge

Aniruddha Chaudhari/183/0
CodePython

A project is currently having issues with some of their libraries where packages are not being built in the correct order. You have been tasked to build a program that will ensure their packages are built correctly. You are given a list of packages to build and an array of dependencies where [Pi, Pj] indicates that you must build package Pi first if you want to take build Pj. Return the correct build order for the given list of packages.

This question was asked in Ethos Life coding interview.

This problem is similar to popular job scheduling or ordering of tasks from given dependencies.

You can use any programming language of your choice like C/C++, Java and Python. I used Python.

Python Program

Prerequisites

  • Python for loop
  • List methods in Python

Python Code

def find_missing_ele(pkg, dep):
    keys = [i[0] for i in dep]
    for i in pkg:
        if i not in keys:
            return i  

def remove_dep(dep, val):
    return [i for i in dep if not i[1] == val]

def get_pkg_order(pkg, dep):
    size = len(pkg)
    out = [""]*size

    for i in range(size):
        value = find_missing_ele(pkg, dep)
        pkg.remove(value)
        out[size-i-1] = value
        dep = remove_dep(dep, value)

    return out

packages=["P0","P1","P2","P3"]
dependencies = [["P2", "P0"],["P1","P2"],["P3","P1"],["P3","P2"]]
print(get_pkg_order(packages, dependencies))

Output

['P3', 'P1', 'P2', 'P0']

To solve this problem you can also use the graph traversing algorithm like DFS or BFS.

Any doubt? Let’s discuss in the comment section below. You can also suggest if you have any other approach to solve a problem of ordering of tasks from given dependencies.

Python Interview Questions eBook

coding challenge
Aniruddha Chaudhari
I am complete Python Nut, love Linux and vim as an editor. I hold a Master of Computer Science from NIT Trichy. I dabble in C/C++, Java too. I keep sharing my coding knowledge and my own experience on CSEstack.org portal.

Your name can also be listed here. Got a tip? Submit it here to become an CSEstack author.

Leave a Reply Cancel reply

Why?

Why Competitive Programming Important?

Coding Challenges for Practice

  1. Count Common Factor
  2. Does it Divide
  3. Sum of Sub Arrays
  4. Pair of Desired Sum
  5. Remove Duplicate Char from String
  6. Sort String by Char Freq (Python)
  7. Sort String by Char Freq (Java)
  8. Split Array into Equal Sum Subarray
  9. Validate IP Address
  10. Validate PAN Card Number
  11. Validate Sudoku
  12. Sort Circular Rotated Array
  13. Min Arrow to Burst Bubbles
  14. Min Cost to Paint All Houses [Amazon]
  15. HourGlass with Largest Sum
  16. Max Profit by Buying/Selling Stocks
  17. Hailstone Sequence
  18. Reverse String without affecting Special Characters
  19. Secure Conversation by Encry/Decry
  20. Special Elements in Matrix
  21. Next Greater No with Same set of Digits
  22. Smallest Subarray with Sum Greater than Given Number
  23. Group Anagrams
  24. Find Duplicates in Array in O(n)
  25. Find Two Unique Numbers from Array in O(n)
  26. Number Patterns & Finding Smallest Number
  27. First Unique Element in a Stream
  28. Flip Equivalent Binary Trees [TeachMint]
  29. Minimum Cost of Merging Files [Amazon]
  30. Minimum Distance for Truck to Deliver Order [Amazon]
  31. Order Task for Given Dependencies
  32. Multilevel Parking System Design
  33. Minimum Coins Required
  34. Max Sum Subarray
  35. Max Avg Sum of Two Subsequences
  36. Merge Overlapping Intervals
  37. Longest Balanced Subarray
  38. Longest Path in a Weighted Tree
  39. Generate Balanced Parentheses
  40. PostOrder Traversal Without Recursion

© 2022 – CSEstack.org. All Rights Reserved.

  • Home
  • Subscribe
  • Contribute Us
    • Share Your Interview Experience
  • Contact Us
  • About
    • About CSEstack
    • Campus Ambassador
  • Forum & Discus
  • Tools for Geek
  • LeaderBoard