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import java.util.Arrays;

import java.util.HashMap;

import java.util.LinkedList;

import java.util.List;

public class GroupAnagrams {

// 12ms

public List<List<String>> groupAnagrams(String[] strs) {

HashMap<String, List<String>> map = new HashMap<>();

for (String s : strs) {

char[] cc = s.toCharArray();

Arrays.sort(cc);

String t = new String(cc);

List<String> list = map.get(t);

if (list == null) {

list = new LinkedList<>();

map.put(t, list);

}

list.add(s);

}

return new LinkedList<>(map.values());

}

}