leetcode-49-字母异位词分组

import collections
class Solution:
    def groupAnagrams(self, strs) :
        ans = collections.defaultdict(list)
        for s in strs:
            ans[tuple(sorted(s))].append(s)
        return ans.values()

另：leetcode可通过：
class Solution: 
    def groupAnagrams(self, strs: List[str]) -> List[List[str]]: 
        from collections import defaultdict 
        lookup = defaultdict(list) 
        for s in strs: 
            lookup[tuple(sorted(s))].append(s) 
        return list(lookup.values())

class Solution:
    def groupAnagrams(self, strs) :
        ans = collections.defaultdict(list)
        for s in strs:
            count = [0] * 26
            for c in s:
                count[ord(c)-ord(‘a‘)] += 1
            ans[tuple(count)].append(s)
        return ans.values()