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The problem Given an integer array nums, return an array answer such that answer[i] is equal to the product of all the elements of nums except nums[i]. The product of any prefix or suffix of nums is guaranteed to fit in a 32-bit integer. You must write an algorithm that runs in O(n) time and without using the division operation. Examples Input: nums = [1,2,3,4] Output: [24,12,8,6] Input: nums = [-1,1,0,-3,3] Output: [0,0,9,0,0] Constraints 2 <= nums....

The problem Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order. Examples Input: nums = [1,1,1,2,2,3], k = 2 Output: [1,2] Input: nums = [1], k = 1 Output: [1] Constraints 1 <= nums.length <= 10^5 -10^4 <= nums[i] <= 10^4 k is in the range [1, the number of unique elements in the array]. It is guaranteed that the answer is unique....

The problem Given an array of strings strs, group the anagrams together. You can return the answer in any order. An anagram is a word or phrase formed by rearranging the letters of a different word or phrase, using all the original letters exactly once. Examples Input: strs = ["eat","tea","tan","ate","nat","bat"] Output: [["bat"],["nat","tan"],["ate","eat","tea"]] Explanation: * There is no string in strs that can be rearranged to form "bat." * The strings "nat" and "tan" are anagrams as they can be rearranged to form each other....

The Problem Given two strings s and t, return true if t is an anagram of s, and false otherwise. An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, using all the original letters exactly once. Examples Input: s = "anagram", t = "nagaram" Output: true Input: s = "rat", t = "car" Output: false Follow-up: What if the inputs contain Unicode characters?...

The Problem Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct. Example Input: nums = [1,2,3,1] Output: true Explanation: The element 1 occurs at indices 0 and 3. Follow-up: Can you come up with an algorithm that has less than O(NlogN) time complexity? Brute Force Solution func containsDuplicate(_ nums: [Int]) -> Bool { var nums = nums let N = nums....