💡 Problem Formulation: In many computer algorithms, it is necessary to track the performance and progress of iterative operations on data. A common instance is finding the index of the last element in an array that will be reduced to zero, when a certain operation is repeatedly applied. For example, given an array and an … Read more
💡 Problem Formulation: In a stream of characters, the challenge is to efficiently determine the first character that does not repeat itself. This is a common problem in software development where, given an input like “aabbcddeff”, the desired output is “c”, because it’s the first character that appears only once in the stream. Method 1: … Read more
💡 Problem Formulation: We are tasked with identifying a specific element in a Python list — the pivotal element. This is the element before which all other elements are smaller and after which all others are larger. For instance, given the list [5, 7, 10, 8, 6], the number ’10’ is our pivotal element because … Read more
💡 Problem Formulation: Imagine you’re creating a game where a player moves along a path, collecting items placed at equal distances. As a developer, you want to calculate the total distance covered when a player collects all items. For example, if there are 4 items placed 10 units apart, and the player starts at the … Read more
💡 Problem Formulation: The task is to find all the substrings within a given text that, with character rearrangement, can match a specific target word. For instance, if the target word is “bat”, and the text is “tbatebatz”, we should find that there are two substrings (“tbate” and “ebat”) which can be rearranged to “bat”. … Read more
💡 Problem Formulation: This article focuses on finding the total count of palindromic substrings within a given string, which are subsequences that read the same forward and backward. Given an input string, our goal is to calculate how many distinct palindromic substrings exist when the input is considered in its sorted form. For instance, if … Read more
💡 Problem Formulation: When dealing with geometrical problems in programming, it’s common to encounter tasks such as finding the coordinates of the fourth vertex of a rectangle when three vertices are known. This task is especially relevant in computer graphics, computer vision and game development. For instance, given vertices A(2, 4), B(6, 4), and C(2, … Read more
5 Best Ways to Rotate a List in Python 💡 Problem Formulation: Rotating a list in Python involves shifting its elements to the left or right with wrap-around, so that the end elements wrap around to the start of the list. If given a list [1, 2, 3, 4, 5] and we want to rotate … Read more
💡 Problem Formulation: We are often tasked with an intriguing programming challenge: given two separate arrays, identify and extract subarrays such that each subarray from the first array has an equivalent sum to another subarray from the second array. Imagine the inputs are array1 = [1, 2, 3, 5] and array2 = [9, 7, 5, … Read more
💡 Problem Formulation: When working with lists in Python, it’s common to encounter scenarios where you need to remove duplicate elements. For instance, you might have a list [1, 2, 2, 3, 3, 3, 4] and want to distill it to only unique values [1, 2, 3, 4]. This article will explore several methods for … Read more
💡 Problem Formulation: In the scenario of a bank with multiple guards, it is vital to calculate the shortest distance between any given point (such as a teller station or an entrance) and the nearest guard. The input would be a map of the bank represented as a grid, with each cell having a clear … Read more
💡 Problem Formulation: When working with Python dictionaries, it’s common to find the need to remove a key-value pair. Suppose you have a dictionary {‘Alice’: 25, ‘Bob’: 28, ‘Charlie’: 20} and you want to remove the key ‘Charlie’ so that your resulting dictionary is {‘Alice’: 25, ‘Bob’: 28}. This article explores different methods to achieve … Read more