Group Anagrams

Given an array of strings, group anagrams together.

Example:

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

Note:

• All inputs will be in lowercase.

• The order of your output does not matter.

分析

用dict[sorted(w)] =list of anagrams

注意sorted(w)是list，要tuple才能做key

class Solution:
    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
        m = collections.defaultdict(list)
        g = [m[tuple(sorted(x))].append(x) for x in strs]
        return m.values()