You are given a string consisting of lowercase English letters and an integer k. Your task is to convert the string into an integer by replacing each letter with its corresponding position in the alphabet (where ‘a’ = 1, ‘b’ = 2, …, ‘z’ = 26), and then repeatedly sum its digits k times. The final result is the integer obtained after performing the digit sum operation k times.
In a simplified programming language, there are only four operations: incrementing or decrementing a variable X by 1. You are given a list of operations that can either increment or decrement the value of X. Your task is to determine the final value of X after applying all the operations.
You are given a 1D integer array called ‘original’ and two integers ’m’ and ’n’. Your task is to convert this 1D array into a 2D array with ’m’ rows and ’n’ columns. The elements from the ‘original’ array should be placed row-wise in the new 2D array.
You are given an array of m observations, each representing a die roll from a 6-sided die, and an average value mean of all n + m rolls. Your task is to calculate the missing n observations such that the overall average of all n + m rolls equals the provided mean. If multiple valid answers exist, return any of them. If it is impossible to achieve the desired average, return an empty array.
You are required to build a system for a bank that automates various account transactions, including deposits, withdrawals, and transfers. The bank has multiple accounts, and each transaction must adhere to specific rules to be considered valid. Implement a class that handles these operations efficiently while ensuring transactional integrity.