Given an array of strings, group anagrams together.
Example:
Input: ["eat", "tea", "tan", "ate", "nat", "bat"],
Output:
[
["ate","eat","tea"],
["nat","tan"],
["bat"]
]
Note:
很多java的接口还是不熟练。
class Solution { public List<List<String>> groupAnagrams(String[] strs) { if(strs == null || strs.length == 0) return new ArrayList<List<String>>(); Map<String,List<String>> map = new HashMap<>(); for(String s: strs){ char[] ca = s.toCharArray(); Arrays.sort(ca); String keyStr = String.valueOf(ca); //将char数组合并成一个string if(! map.containsKey(keyStr)) map.put(keyStr, new ArrayList<String>()); //map的添加 map.get(keyStr).add(s); } return new ArrayList<List<String>>(map.values()); } }
原文：https://www.cnblogs.com/jamieliu/p/10421865.html