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class Solution {

public String[] permutation(String s) {

List<String> result = new ArrayList<>();

boolean visited[] = new boolean[s.length()];

char arr[] = s.toCharArray();

Arrays.sort(arr);

StringBuilder x = new StringBuilder();

helper(result,visited,arr,x);

String res[] = new String[result.size()];

for(int i=0;i<result.size();i++){

res[i] = result.get(i);

}

return res;

}

public void helper(List<String> result,boolean visited[],char arr[],StringBuilder x){

if(x.length()==arr.length){

result.add(x.toString());

return;

}

for(int i=0;i<arr.length;i++){

if(i!=0&&arr[i]==arr[i-1]&&visited[i-1]) continue;

if(!visited[i]){

x.append(arr[i]);

visited[i] = true;

helper(result,visited,arr,x);

x.deleteCharAt(x.length()-1);

visited[i] = false;

}

}

}

}