0049. Group Anagrams

https://leetcode.com/problems/group-anagrams

Description

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"]
**Output:** [["a"]]

Constraints:

• 1 <= strs.length <= 104

• 0 <= strs[i].length <= 100

• strs[i] consists of lowercase English letters.

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