💡 Problem Formulation: Given a digit list representing a non-negative integer, we want to add one to the integer and return the resulting number as a digit list. For example, if the input is [1, 2, 3], which represents the number 123, after adding one, the output should be [1, 2, 4]. Method 1: Iterative … Read more

💡 Problem Formulation: Sometimes, we need an efficient way to determine the smallest number of elements that need to be added to a given set to reach a specified target sum. Imagine you have an array [1, 2, 3] and your target sum is 7. The minimal element additions needed would be [3, 1], which … Read more

💡 Problem Formulation: In many applications involving text processing, it’s essential to determine the number of distinct substrings that a given string can produce. This task becomes more challenging when addressing different queries, perhaps in a dynamic programming or database context. For example, given the input string “aab”, we might want to know the number … Read more

💡 Problem Formulation: The challenge is to compute the maximum sum of any subarray, then take its modulus by a given number m. For example, given an array [3, 3, 9, 9, 5] and m = 7, the maximum sum of a subarray modulo m is 6 which comes from the subarray [3, 3] where … Read more

💡 Problem Formulation: We are tasked with determining whether a given array can be rearranged such that the difference between each pair of adjacent elements is the same. This is particularly useful in applications where equidistant data points are necessary. For example, given an array [3, 5, 1, 4, 2], the solution should allow us … Read more

💡 Problem Formulation: Python has several techniques to simplify extracting and summing the digits from an alphanumeric string. An alphanumeric string such as “a5b3c9” consists of both letters and numbers. The goal is to programmatically sum up all the numbers within this string, so the expected result for this example would be 5 + 3 … Read more

💡 Problem Formulation: This article addresses the challenge of determining whether a given number is a perfect square in Python without utilizing the sqrt() function. For instance, given the input 16, the output would affirm that 16 is a perfect square because 4 * 4 equals 16. Method 1: Iterative Approach This method involves iterating … Read more

💡 Problem Formulation: Detecting whether a given integer is a power of two is a common task in programming. In Python, there are several ways to achieve this. For instance, given the input number 8, the output should be True since 8 is 2 raised to the power of 3. Conversely, if the input is … Read more

💡 Problem Formulation: Consider there are two spheres in a 3D environment, each with their initial positions and velocities. The question arises: given the possibility to adjust their accelerations, can we determine if these two spheres will ever meet or cross paths at any point in time? The input comprises the start positions, velocities, and … Read more

💡 Problem Formulation: Imagine needing to find the shortest distance of a specified character ‘c’ from every index in a given string. For example, given the input string “algorithm” and the character ‘a’, the desired output would be a list [0,1,2,3,4,5,6,7,8], representing the distance from ‘a’ at each index. Method 1: Brute Force Search This … Read more

💡 Problem Formulation: The task is to identify the missing term from an incomplete arithmetic sequence. Suppose you have a list representing an arithmetic sequence with one term removed, the goal is to write a Python program that can find and return this missing number. For instance, if given [3, 7, 11, 19], with a … Read more

💡 Problem Formulation: When dealing with binary data, a common problem is to verify whether all occurrences of the digit ‘1’ are consecutive. In Python, there are various ways to approach this problem. For instance, given the input ‘00111110010’, the desired output is False because not all ‘1’s are adjacent. However, for the input ‘00011111000’, … Read more