# [LeetCode] 49. Group Anagrams 群组错位词

Given an array of strings, group anagrams together.

Example:

Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
Output:
[
["ate","eat","tea"],
["nat","tan"],
["bat"]
]

Note:

• All inputs will be in lowercase.
• The order of your output does not matter.

class Solution {
public:
vector<vector<string>> groupAnagrams(vector<string>& strs) {
vector<vector<string>> res;
unordered_map<string, int> m;
for (string str : strs) {
string t = str;
sort(t.begin(), t.end());
if (!m.count(t)) {
m[t] = res.size();
res.push_back({});
}
res[m[t]].push_back(str);
}
return res;
}
};

class Solution {
public:
vector<vector<string>> groupAnagrams(vector<string>& strs) {
vector<vector<string>> res;
unordered_map<string, vector<string>> m;
for (string str : strs) {
vector<int> cnt(26);
string t;
for (char c : str) ++cnt[c - 'a'];
for (int i = 0; i < 26; ++i) {
if (cnt[i] == 0) continue;
t += string(1, i + 'a') + to_string(cnt[i]);
}
m[t].push_back(str);
}
for (auto a : m) {
res.push_back(a.second);
}
return res;
}
};

Github 同步地址：

https://github.com/grandyang/leetcode/issues/49

Valid Anagram

https://leetcode.com/problems/group-anagrams/

https://leetcode.com/problems/group-anagrams/discuss/19176/share-my-short-java-solution

https://leetcode.com/problems/group-anagrams/discuss/19200/10-lines-76ms-easy-c-solution-updated-function-signature

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posted @ 2015-04-02 06:14  Grandyang  阅读(20990)  评论(11编辑  收藏  举报