💡 Problem Formulation: When working with lists in Python, a common necessity arises where we need to access both the index and the value of each element. For instance, given a list [“apple”, “banana”, “cherry”], we may need to retrieve a pair of index and element, such as (0, “apple”), for each item in the … Read more

💡 Problem Formulation: Working with Python dictionaries is fundamental for data manipulation, but newcomers may be unsure how to retrieve values associated with specific keys. For instance, given a dictionary {“name”: “Alice”, “age”: 30}, how does one access the value associated with the key “age” to get the output 30? This article will explore different … Read more

💡 Problem Formulation: When dealing with lists in Python, it’s common to encounter a mix of data types. The challenge lies in summing all the numeric values within such a heterogeneous list while excluding non-numeric items. Consider the input [1, ‘a’, 3, ‘4’, 5] where the desired output is 9, considering ‘4’ as a non-numeric … Read more

💡 Problem Formulation: Log files often contain a mix of text and numerical data organized chronologically or in a manner not suitable for data analysis. The requirement is to reorder this data to make the logs more readable or structured for easier processing. For instance, we might have an input log like [‘error 404’, ‘warn: … Read more

💡 Problem Formulation: A mountain array is an array of integers where numbers first ascend to a peak value and then descend. It’s not a mountain array if it doesn’t start with an ascent and immediately descend after a single peak or if the climb or descent is missing altogether. For instance, the array [1, … Read more

💡 Problem Formulation: How do you verify if a certain pattern or substring exists within a larger string in Python? For instance, checking if the string “cat” is present within the sentence “The black cat jumped over the lazy dog.” The desired output would be a confirmation that the substring “cat” does indeed occur within … Read more

💡 Problem Formulation: Given a 2D dataset in Python, we may encounter the requirement to delete columns to ensure that each row of the resulting dataset remains sorted. Consider having a matrix [[3, 2, 3], [0, 1, 4], [1, 5, 6]]. The goal is to remove the minimum number of columns such that the rows … Read more

💡 Problem Formulation: In Python, working with integers that power up your computations can be both necessary and challenging. One common task is finding integers that can be expressed as x raised to the power of y, where x and y are also integers. For example, given an integer like 8, the desired output would … Read more

💡 Problem Formulation: In computational geometry, a common task is to determine the largest perimeter of a triangle that can be formed from a given list of sticks, where each stick represents a side length. The goal is to find a combination of three side lengths that not only forms a valid triangle (where the … Read more

💡 Problem Formulation: Determining whether binary strings start with prefixes that are divisible by 5 can be a complex task. For instance, given the input binary string “1001”, its prefixes “1”, “10”, “100”, “1001” are converted to integers and checked for divisibility by 5. The desired output should indicate which prefixes satisfy this condition. Method … Read more

💡 Problem Formulation: When working with sets of file paths, a common requirement is to find the longest common prefix that represents the shared directory structure. To illustrate, given a list of file paths like [“/home/user/project/src/main.py”, “/home/user/project/src/utils.py”, “/home/user/project/README.md”], we aim to extract the longest common path, which, in this case, is “/home/user/project”. Method 1: Using … Read more

💡 Problem Formulation: In geometry, two triangles are considered congruent if their corresponding sides and angles are equal. Our goal is to write a program to verify if a pair of triangles is congruent based upon given side lengths (and possibly angles). For instance, if Triangle A has sides of lengths 3, 4, 5 and … Read more