動機

水題~~

Problem

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 lower-case English letters.

Sol

sort後再用hash

class Solution:
    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
        tbl = {}
        for s in strs:
            ss = tuple(sorted(s))
            if ss in tbl:
                tbl[ss].append(s)
            else:
                tbl[ss] = [s]
        return list(tbl.values())