Howto

💡 Problem Formulation: You’re given an array of ice cream bars’ costs and an amount of coins. The goal is to find out the maximum number of ice cream bars you can buy with those coins. For example, if the input array is [1,3,2,4,1], and the amount of coins is 7, the output should be … Read more

💡 Problem Formulation: The task is to partition a given array into disjoint (non-overlapping) intervals where no element in the first interval is greater than any element in the second. For example, given the input array [5, 0, 3, 8, 6], one possible partition could be [5, 0, 3] and [8, 6], with the respective … Read more

💡 Problem Formulation: We aim to solve the problem of finding the maximum XOR (exclusive OR) value for a set of queries, where each query consists of a list of integers. Given an array of numbers and a series of queries, each containing a single number, we seek to identify the maximum XOR value when … Read more

💡 Problem Formulation: In Python programming, one commonly encountered problem is to find the maximum number of consecutive integers in an unsorted list. For an input array like [1, 94, 93, 1000, 5, 92, 78], the output should be 3, representing the longest consecutive sequence (92, 93, 94). Method 1: Sorting and Iterative Checking This … Read more

💡 Problem Formulation: The task is to find the length of the longest subsequence in a given sequence of natural numbers that is also a Fibonacci subsequence. For example, given an input array [1, 3, 9, 4, 7, 10, 5], the longest Fibonacci subsequence is [1, 3, 4, 7] and its length is 4. Method … Read more

💡 Problem Formulation: We want to create a Python program that can find the number of pairs of equal-length substrings within a given string. For instance, given the input string “ABABA”, where the substrings ‘AB’ and ‘BA’ appear twice (as overlapping substrings) and ‘A’ appears twice consecutively, the desired output would be the count of … Read more

💡 Problem Formulation: Imagine you have a string and you want to find the number of similarities it shares with all of its possible substrings. This means that if we have a string like ‘ABA’, we want to calculate how many times each substring appears within the string, including the string itself. For example, ‘A’ … Read more

💡 Problem Formulation: When working with text data, one might need to sort phrases or words by their frequency of occurrence. This task is common in data analysis, where insights are often drawn from the most frequently mentioned terms. Suppose we have a list of phrases [‘apple’, ‘banana’, ‘apple’, ‘orange’, ‘banana’, ‘banana’], and we need … Read more

💡 Problem Formulation: A ‘nice’ subarray is defined by a specific condition set by the user, such as having a sum that is even, or containing a certain number of odd numbers. This article will explore how to count the number of nice subarrays within an integer array in Python. For example, given an input … Read more

💡 Problem Formulation: Imagine you’re looking at a skyline of buildings of varying heights from a fixed point. Some buildings are not visible because taller buildings block them. The goal is to identify buildings that have an unobstructed view towards the observer, presuming we’re looking from east to west. Given an array of heights representing … Read more

💡 Problem Formulation: The task is to find the minimum absolute sum difference between two arrays of equal length. Given arrays arr1 and arr2, the goal is to compute the sum of absolute differences for each pair of elements, and then return the smallest possible sum after modifying at most one element from arr1. For … Read more

💡 Problem Formulation: Imagine we have a queue where, after accessing an element, this element needs to move to the end of the queue to signify that it has been recently used. For a queue with the elements [1, 2, 3, 4], accessing the element ‘2’ should rearrange the queue to [1, 3, 4, 2]. … Read more