Emily Rosemary Collins

💡 Problem Formulation: You are given a set of letters, and you need to determine the maximum length of a word that can be constructed using these letters. For example, with the input letters ‘a’, ‘b’, ‘c’, ‘k’, ‘l’, the output might be 5 if ‘black’ is the longest word that can be formed from … Read more

💡 Problem Formulation: You want to find out the nearest future time that can be formed by reusing the digits from a given time. For instance, if the time is “23:59”, the nearest time using those digits is “22:22” the next day. This article explores different methods to achieve this in Python. Method 1: Brute … Read more

💡 Problem Formulation: We aim to find the length of the longest alternating path in a binary tree where no two adjacent nodes have the same value. This path can move from parent to child or from child to parent, constituting an alternating sequence. Given a binary tree, for example, the input could be a … Read more

Method 1: Using Nested Loops This method involves iterating over the characters in the string with nested loops to construct the zigzag pattern. The outer loop manages the lines (up to k), and the inner loop calculates the appropriate indices for characters in the current line. The characters are then appended to a separate string … Read more

💡 Problem Formulation: The task is to traverse and print the elements of a 2D array (matrix) in a spiral order, starting from the top-left corner and progressively moving inwards. For instance, given a 3×3 matrix with elements from 1 to 9, the output should be 1 2 3 6 9 8 7 4 5. … Read more

💡 Problem Formulation: You are given four lists of integers and a target sum. The challenge is to find the number of unique quadruples (each element from a different list) that can be formed such that their sum is less than the given target value. For example, given lists [1, 2], [2, 3], [3, 4], … Read more

💡 Problem Formulation: Imagine you have been provided with a list of words and you want to determine the number of concatenated words present within that list. A concatenated word is defined as a word that can be constructed by concatenating two or more smaller words also present in the list. For example, if the … Read more

💡 Problem Formulation: In this article, we explore how to generate all possible strings that can be typed using a traditional phone keypad. Each number (2-9) on a phone keypad corresponds to a set of letters. For example, 2 corresponds to “abc”. Given a sequence of number inputs like ’23’, we aim to find all … Read more

💡 Problem Formulation: Developers often encounter the need to organize data for efficiency and utility. Specifically, this article addresses how to sort elements of a linked list in ascending order. Suppose you have a linked list: 3 -> 1 -> 4. The desired output is a sorted linked list: 1 -> 3 -> 4. Correctly … Read more

💡 Problem Formulation: Imagine you possess a certain inventory quantity of a product and you need to calculate how many items will be remaining after selling a specific number of them. For example, if your initial inventory is 100 items and you sell 30, you want your program to output 70 as the remaining items. … Read more

💡 Problem Formulation: The N Queens puzzle is a classic algorithmic problem where one must place N chess queens on an N×N chessboard so that no two queens threaten each other. A valid solution requires that no two queens share the same row, column, or diagonal. This article provides Python methods to verify if a … Read more

💡 Problem Formulation: Checking for symmetry in geometric shapes can be performed algorithmically by analyzing point coordinates. In this article, we explore methods to determine if a given list of block representations, defined by their corner points, are symmetric with respect to the X-Y line. Say we have the input of coordinates [(1, -1), (-1, … Read more