Given an array nums of size n, return the majority element. The majority element is the element that appears more than n // 2 times. You may assume that the majority element always exists in the array.
Given an integer array, find all elements that appear more than ⌊n/3⌋ times, where n is the length of the array. Your task is to return a list of all such elements.
Given two strings ransomNote and magazine, return true if ransomNote can be constructed by using the letters from magazine. Each letter in magazine can only be used once.
Given a string, sort its characters based on their frequency of occurrence in descending order. If multiple solutions are possible, any valid answer is acceptable. The frequency of each character refers to how many times it appears in the string.
