Concise Python solution beats 72.9%


  • 0
    Y
    from collections import defaultdict
    class Solution(object):
        def groupAnagrams(self, strs):
            """
            :type strs: List[str]
            :rtype: List[List[str]]
            """
            if not strs or len(strs) == 0:
                return []
            strDict = defaultdict(list) # use defualtdict(list) to get things faster(dict() still works anyway)
            for s in strs:
                ch = ''.join(sorted(s)) #sort string s
                strDict[ch].append(s) #append s to strDict[ch](strDict[ch] will generate an empty list if ch not in strDict)
                
            return strDict.values()
    

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