Group Anagrams

Problem Statement

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

Examples

Example 1:

Input: strs = ["eat","tea","tan","ate","nat","bat"]
Output: [["bat"],["nat","tan"],["ate","eat","tea"]]

Explanation:

• “bat” has no anagrams in the list.
• “nat” and “tan” are anagrams of each other.
• “ate”, “eat”, and “tea” are anagrams of each other.

Example 2:

Input: strs = [""]
Output: [[""]]

Example 3:

Input: strs = ["a"]
Output: [["a"]]

Constraints

• 1 <= strs.length <= 10^4
• 0 <= strs[i].length <= 100
• strs[i] consists of lowercase English letters.

Code Template

class Solution:
    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
        # Your code here
        pass

Solutions

• Solution 1 - Using character count as a signature to group anagrams. Time complexity: O(N * K), Space complexity: O(N * K).

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