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leetcode Group Anagrams

Given an array of strings, group anagrams together.

For example, given: ["eat", "tea", "tan", "ate", "nat", "bat"], Return:

[ ["ate", "eat","tea"], ["nat","tan"], ["bat"]] Note: All inputs will be in lower-case. 题目地址:leetcode Group Anagrams

题目大意: 给定一些字符串,有的字符串是由字符串颠倒的,比如eat->tea 要求找出所有的这些单词

思路:直接用将每个字符串放入排好序后的桶中(hash)即可。

C++

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class Solution {
public:
vector<vector<string>> groupAnagrams(vector<string>& strs) {
unordered_map<string, vector<string>> map;
for(string &s : strs){
string t(s);
sort(t.begin(), t.end());
map[t].push_back(s);
}

vector<vector<string>> ans;
auto it = map.begin();
for(;it != map.end();++it){
ans.push_back(it->second);
}
return ans;
}
};

Python

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class Solution(object):
def groupAnagrams(self, strs):
"""
:type strs: List[str]
:rtype: List[List[str]]
"""
m = collections.defaultdict(list)
for s in strs:
m[''.join(sorted(s))].append(s)
return list(m.values())

 

本文是leetcode如下的题解

  • 49. Group Anagrams

更多题解可以查看: https://www.hrwhisper.me/leetcode-algorithm-solution/

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