Discover data structures and algorithms using Python. Gain insights into solving real-world problems and typical interview questions with detailed reviews, explanations, and hands-on coding exercises.

Data structures and algorithms are among the most fundamental concepts of Computer Science. Whether it’s real-world problems you’re trying to solve or the typical coding question asked in an interview, almost every problem requires you to demonstrate a deep understanding of data structures and algorithms. 

This course is a detailed review of some of the most common data structures and algorithms that you’ll see in interviews and your everyday work. With implementation details, thorough explanations, and hands-on coding exercises, you’ll quickly gain the confidence you need to solve any problem, no matter the situation.

Data Structures and Algorithms in Python

# Problem

In this exercise, you are required to find pairs from a doubly linked list which sum to a specified number. 

An example is illustrated for you below. 

# Coding Time!

In the code below, `pairs_with_sum` is a class method of the `DoublyLinkedList` class. You cannot see the rest of the code as it is hidden. As `pairs_with_sum` is a class method, please make sure that you don't change the indentation of the code provided to you. You are required to write your solution under the function prototype. 

The pairs from `pairs_with_sum` have to follow this condition; for a pair (`a`,`b`), `a` should come before `b`  in the doubly linked list while it is traversed from the head node. 

For this exercise, you are required to return a **Python list** containing the pairs as string types in the following format:

```
(a,b)
```

For example, the pairs for the linked list shown in the illustration are as follows:
```
["(1,4)","(2,3)"]
```

Failure to return the answers in the required format will fail the test cases. 

Good luck!

Challenge yourself with an exercise in which you'll have to find pairs from a doubly linked list which sum to some number. 

Introduction

Stack

Singly Linked Lists

Circular Linked Lists

Doubly Linked Lists

Arrays

Binary Trees

Binary Search Trees

Binary Search

Recursion

String Processing

Exercise: Pairs with Sums

Problem