题目
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.
频度: 4
解题之法
class Solution {
public:
vector<vector<string>> groupAnagrams(vector<string>& strs) {
unordered_map<string, multiset<string>> mp;
for (string s : strs) {
string t = s;
sort(t.begin(), t.end());
mp[t].insert(s);
}
vector<vector<string>> anagrams;
for (auto m : mp) {
// 注意这种初始化方式
vector<string> anagram(m.second.begin(), m.second.end());
anagrams.push_back(anagram);
}
return anagrams;
}
};