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Problem Statement

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, typically using all the original letters exactly once.

Example 1:

Input: strs = [“eat”,“tea”,“tan”,“ate”,“nat”,“bat”]

Output: [[“bat”],[“nat”,“tan”],[“ate”,“eat”,“tea”]]

Example 2:

Input: strs = [""]

Output: [[""]]

Example 3:

Input: strs = [“a”]

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Problem Statement

Given an array of integers nums and an integer target, return indices of the two numbers such that they add up to target.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

You can return the answer in any order.

Example 1:

Input: nums = [2,7,11,15], target = 9

Output: [0,1]

Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].

Problem Link

Problem Statement

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, typically using all the original letters exactly once.

Example 1:

Input: s = “anagram”, t = “nagaram”

Output: true

Example 2:

Input: s = “rat”, t = “car”

Output: false

Problem Link

Problem Statement

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 1:

Input: nums =

Output: true

Example 2:

Input: nums =

Output: false

Example 3:

Input: nums =

Output: true

Solutions:

1. Brute force

Given that we have an array of elements to identify if a given element is duplicated, we will compare the element with the rest of the array and this needs to be done for all the elements in the array.