💡 Problem Formulation: You are given a string and you need to verify if the characters appear in a specific order. Using Python’s OrderedDict from the collections module, this task can be implemented effectively. For instance, given the string “programming” and the pattern “gm”, we want to check if the characters ‘g’ and ‘m’ appear … Read more
💡 Problem Formulation: Working with ordered dictionaries (OrderedDict) in Python presents a specific challenge when one needs to insert an item at the beginning while maintaining the order of existing entries. If you have an OrderedDict od and you want to insert a new key-value pair (‘new_key’, ‘new_value’) such that it becomes the first element … Read more
💡 Problem Formulation: You have a list of dictionaries and you want to sort this list based on the values of a specific key. For example, if you have a list of employee records where each record is a dictionary containing the employee’s name and their salary, you want to sort this list by the … Read more
💡 Problem Formulation: Suppose you’re working with a list of dictionaries in Python, and you need to sort this list based on the value of one of the keys in the dictionaries. For example, if you have the input [{‘name’: ‘Alice’, ‘age’: 25}, {‘name’: ‘Bob’, ‘age’: 30}, {‘name’: ‘Charlie’, ‘age’: 20}], you may want to … Read more
💡 Problem Formulation: When working with dictionaries in Python, you may often require a list of unique values. For instance, given a dictionary {‘a’: 1, ‘b’: 2, ‘c’: 1}, you may want to extract the set of unique values {1, 2}. This article showcases several techniques to achieve this, addressing various scenarios and performance considerations. … Read more
💡 Problem Formulation: Developers often need to count the number of lowercase characters within a string when working with text in Python. This is useful in a variety of scenarios, such as validating password strength, analyzing text data, or processing user inputs. For instance, given the string “Python 3.8”, the desired output would be 6 … Read more
💡 Problem Formulation: How can you take two strings as input in Python and determine which string is larger based on length, without utilizing built-in functions? Imagine receiving inputs such as string1 = “Hello” and string2 = “Greetings!” and needing to display “Greetings!” as output since it is the longer string. Method 1: Iterate and … Read more
Finding All Connected Components in an Undirected Graph with Python DFS 💡 Problem Formulation: In graph theory, a connected component of an undirected graph is a subgraph in which any two vertices are connected to each other by paths. The problem addressed in this article is how to identify all such connected components using the … Read more
💡 Problem Formulation: Calculating the length of a string in Python is a basic task that’s commonly done using the built-in len() function. But what if you need to find out the length without using this function? This article will explore alternative methods to achieve this. For instance, given the input “hello”, the desired output … Read more
💡 Problem Formulation: Creating a mirror copy of a binary tree involves flipping the tree horizontally so that each left child becomes a right child and vice versa, effectively creating a mirrored version. Additionally, displaying the mirrored tree with a Breadth-First Search (BFS) traversal provides a level-wise output. This article tackles the input of a … Read more
💡 Problem Formulation: The maximum subarray problem involves finding the contiguous subarray within a one-dimensional array of numbers which has the largest sum. For instance, given the array [-2, 1, -3, 4, -1, 2, 1, -5, 4], the contiguous subarray with the largest sum is [4, -1, 2, 1], with a sum of 6. Method … Read more
💡 Problem Formulation: We aim to determine whether an undirected graph contains a cycle using the Breadth-First Search (BFS) algorithm in Python. Given an undirected graph represented as an adjacency list or matrix, the desired output is a Boolean value indicating the presence or absence of a cyclic structure. Method 1: Standard BFS with Parent … Read more