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Solution.java
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Solution.java
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public class Solution {
public List<List<String>> groupAnagrams(String[] strs) {
Arrays.sort(strs);
String[] newStrs=new String[strs.length];
for (int i = 0; i < strs.length; i++) {
char[] c=strs[i].toCharArray();
Arrays.sort(c);
newStrs[i]=String.valueOf(c);
}
Map<String,List<Integer>> map=new HashMap<String, List<Integer>>();
for (int i = 0; i < newStrs.length; i++) {
String str=newStrs[i];
List<Integer> list=null;
if (map.get(str)==null) {
list=new ArrayList<Integer>();
}else {
list=map.get(str);
}
list.add(i);
map.put(str, list);
}
List<List<String>> ans=new ArrayList<List<String>>();
Set<String> keySet = map.keySet();
for (String s:keySet) {
List<Integer> l=map.get(s);
List<String> list=new ArrayList<String>();
for (int i = 0; i < l.size(); i++) {
list.add(strs[l.get(i)]);
}
ans.add(list);
}
return ans;
}
}