49. Grouping of anagrams

Topic: 49. Grouping of Alphabetical Anagrams

Link: https://leetcode-cn.com/problems/group-anagrams/description/

The title description is very clear.

Given an array of strings, group anagrams together. Alphabetical anagrams are strings of the same letters but different arrangements.

Example:

input: ["eat", "tea", "tan", "ate", "nat", "bat"] ,
 output:
[
  ["ate","eat","tea"],
  ["nat","tan"],
  ["bat"]
]

illustrate:

• All input is lowercase.
• The order in which the answers are output is not considered.

I don't know the correct solution, I wrote it blindly.

python：

import collections
def getCntRet(s):
    ret = []
    for (key,val) in (collections.Counter(s)).items():
        ret.append(str(key)+str(val))
    output=""
    for item in sorted(ret):
        output+=item
    return output
class Solution:
    def groupAnagrams(self, strs):
        """
        :type strs: List[str]
        :rtype: List[List[str]]
        """
        dic=dict()
        for item in strs:
            temp = getCntRet(item)
            # for i in range(len(item)):
            #     temp|=(1<<(ord(item[i])-ord("a")))
            if str(temp) in dic:
                dic[str(temp)].append(item)
            else:
                dic[str(temp)]=[]
                dic[str(temp)].append(item)
        ret = []
        for (key,val) in dic.items():
            ret.append(val)
        return right