💡 Problem Formulation: Often during coding in Python, we manipulate strings through various operations like replacing characters, stripping whitespace, etc. The challenge lies in knowing the final state of a string after such modifications. Take for example the input string “Hello, World!” undergoing a replacement of “World” with “Python”. The desired output would be “Hello, … Read more

💡 Problem Formulation: We aim to identify a single number that, when XORed with every element in an array of integers, results in the minimum possible sum of the outcomes. For instance, given the input array [1, 2, 3], a solution would return a number x such that (1 XOR x) + (2 XOR x) … Read more

💡 Problem Formulation: The challenge is to determine a positive integer m that, given a positive integer n, maximizes the Greatest Common Divisor (gcd) of n and m. For instance, if the input n is 10, a desired output for m would be 5, yielding the maximum gcd of 5. Method 1: Brute Force Search … Read more

💡 Problem Formulation: Given a list of numbers, the goal is to find a sorted subsequence of size 3, where the numbers are in ascending order, without sorting the entire list. This challenge requires a solution that runs in O(n) time complexity. As an example, for the input list [4, 3, 2, 5, 1], a … Read more

💡 Problem Formulation: We aim to find a string that is lexicographically between two given strings. This means the string should appear after the first string and before the second string when sorted alphabetically. For instance, given strings “apple” and “banana”, a desired output might be “apricot” as it fits lexicographically between them. Method 1: … Read more

💡 Problem Formulation: This article addresses the challenge of identifying strings where each character is lexicographically greater than its immediate follower. For instance, given the input ‘cbad’, the desired output is ‘true’ since ‘c’ > ‘b’, ‘b’ > ‘a’, and ‘a’ > ‘d’. Conversely, for ‘abcd’, the output should be ‘false’ as the sequence does … Read more

💡 Problem Formulation: The task is to identify all unique substrings within a provided string that read the same backwards as forwards, known as palindromes. For example, given the input string “aabbbaa”, the desired output should be a set of distinct palindromes such as {“a”, “aa”, “b”, “bb”, “bbb”, “abbba”, “aabbbaa”}. Method 1: Brute Force … Read more

💡 Problem Formulation: This article seeks to address the challenge of finding the sum of maximum differences from all possible subsets of a given array. Suppose you have an array arr = [1, 2, 3], the aim is to determine the total maximum difference of each subset. For instance, the subsets of arr would be … Read more

💡 Problem Formulation: We aim to find the smallest difference between the maximum and minimum values where each value comes from one of three different sorted arrays. Given three lists l1, l2, and l3, the challenge is to find the smallest possible value of max(a, b, c) – min(a, b, c) where a, b, and … Read more

💡 Problem Formulation: The challenge addressed in this article is to identify the different sums for which a given array can be divided into several subarrays of equal sum. For example, given an input array [1, 2, 3, 4, 6], the desired output would be [6], as the array can be split into subarrays [1, … Read more

💡 Problem Formulation: Calculating the surface area of a 3D figure is a common challenge in fields like mathematics, physics, and computer graphics. In Python, this entails creating functions that can take the dimensions of various shapes as input and return the total surface area as output. For instance, if the input is the radius … Read more

💡 Problem Formulation: We wish to determine the earliest palindromic time that comes after a given input time. A time is palindromic when it reads the same backward as forward (e.g., 12:21 or 05:50). Given an input time, say 22:58, we would expect to find the next palindromic time, which in this case would be … Read more