You are given an array of positive integers candidates. Your task is to evaluate the bitwise AND of every possible combination of numbers in the array and return the size of the largest combination where the result of the AND operation is greater than 0. Each number in the array may only be used once in each combination.
You are given a string num consisting of digits, where each digit represents a specific number. The task is to verify if for every index i in the string, the digit at index i appears exactly num[i] times in the entire string. Return true if the condition holds for all indices, and false otherwise.
You are given two arrays: one containing a series of messages, and another with the names of the senders corresponding to each message. A message is a list of words separated by spaces. Your task is to determine which sender has sent the most words across all their messages. If there is a tie for the most words, return the sender with the lexicographically larger name.
You are given two strings, s and target. Your task is to determine the maximum number of times you can rearrange the characters of s to form the string target. A character from s can only be used once in the target string, and the letters must be rearranged to form a new target string each time.
You are given a list of distinct positive integers, nums, and a list of operations. Each operation consists of two elements: operations[i][0] and operations[i][1]. In each operation, you need to replace the element operations[i][0] in nums with the new value operations[i][1]. The number operations[i][1] is guaranteed to not already be in nums. After performing all the operations, return the final array.
Given a string s consisting of both uppercase and lowercase English letters, return the greatest letter that appears as both a lowercase and uppercase letter in the string. The returned letter should be in uppercase. If no such letter exists, return an empty string.