共计 729 个字符，预计需要花费 2 分钟才能阅读完成。
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.
难度：medium
题目：给定一个字符串数组，将 颠倒字母而成的单词 组合在一起。注意：所有输入都为小写字母
思路：都按字母序排序。
Runtime: 14 ms, faster than 85.30% of Java online submissions for Group Anagrams.Memory Usage: 34.1 MB, less than 16.58% of Java online submissions for Group Anagrams.
class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Map<String, List<String>> msl = new HashMap<>();
for (int i = 0; i < strs.length; i++) {
char[] sc = strs[i].toCharArray();
Arrays.sort(sc);
String ns = new String(sc);
msl.putIfAbsent(ns, new ArrayList<String>());
msl.get(ns).add(strs[i]);
}
return new ArrayList(msl.values());
}
}
