Group Anagrams - Leetcode 49 - Python

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.

 

class Solution:

    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:

        ans = defaultdict(list)

        

        for string in strs:

            cnt = [0] * 26 #a-z

            

            for char  in string:

                cnt[ord(char) - ord("a")] +=1

                

            ans[tuple(cnt)].append(string)

            

        return ans.values()

    

    

             

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