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Given an array of strings, group anagrams together.
For example, given: ["eat", "tea", "tan", "ate",
"nat", "bat"]
,
Return:
[ ["ate", "eat","tea"], ["nat","tan"], ["bat"] ]
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思路:
使用先将字符串数组排序(这样可以保证输出的顺序);
使用HashMap<String, List<String>>,key(String):是第一次出现的字符串;value(List<String>):用于保存所有相同字母乱序的值。
java code:
public 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<String, List<String>>(); Arrays.sort(strs); for(String str : strs) { char[] cs = str.toCharArray(); Arrays.sort(cs); String keyStr = new String(cs); if(!map.containsKey(keyStr)) map.put(keyStr, new ArrayList<String>()); map.get(keyStr).add(str); } return new ArrayList<List<String>>(map.values()); } }
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原文地址:http://blog.csdn.net/itismelzp/article/details/51538229