💡 Problem Formulation: The challenge is to locate a position within an array such that the product of elements in the subarray to the left is equal to the product of elements in the subarray to the right. Given an input array like [1, 2, 3, 6, 5, 6], the desired output is the index … Read more
💡 Problem Formulation: You have an array where initially, the sequence of elements decreases and then strictly increases, or vice versa—formulating a “turning point” or “peak” in the sequence. The task is to identify the index of this turning element. For instance, with an input array [5, 4, 3, 2, 3, 4, 5], the output … Read more
💡 Problem Formulation: Consider a given mapping where digits are associated with certain characters, similar to the way digits are linked to letters on a telephone keypad. The problem involves finding all possible strings that can be formed from the characters corresponding to a given sequence of digits. For instance, if ‘2’ maps to ‘abc’ … Read more
💡 Problem Formulation: Given a binary matrix (a 2D list) where ‘0’ represents an empty space and ‘1’ signifies any arbitrary blockage, the challenge is to find all the rectangles composed entirely of ‘0’s. These rectangles may vary in size and position across the matrix, and the desired output is a list of coordinates that … Read more
💡 Problem Formulation: The task at hand is to devise methods in Python that can efficiently locate and return all the distinct palindromic substrings within a given string. For instance, given the input string “aabbbaa”, the desired output would be a collection of substrings like [“aa”, “bb”, “bbb”, “aabbaa”], including duplicates only if they occur … Read more
💡 Problem Formulation: We want to identify “good” indices in an array. A “good” index is defined as an array element that meets a specified condition, such as being greater than its neighbors. Given an array, for instance, [1, 3, 5, 4, 3, 2], our goal is to find indices of elements that are local … 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: 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: 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: Automating the login process on web pages is a common task during web scraping or testing. Precisely, filling out username and password fields on a login page using Selenium WebDriver in Python is a frequent necessity. Inputs are typically the username and password strings, while the desired output is successful sign-in into … Read more
💡 Problem Formulation: Given two sorted linked lists that may share some common nodes, we aim to construct a new sorted linked list that maximizes the sum of the node values. The challenge is to traverse the original lists while selecting the nodes that contribute to the largest possible sum without missing any common nodes. … Read more
💡 Problem Formulation: You need to create an array wherein each element is unique, the total sum of elements equals a specified number, and each element does not exceed a given upper bound. For example, given a size of 5, a sum of 50, and an upper bound of 20, a possible output might be: … Read more