# Error msg doesn't make sense

• ``````public class Solution {
public ArrayList<ArrayList<Integer>> permute(int[] num) {
if (num==null) return null;
Set<ArrayList<Integer>> existLists = new Set<ArrayList<Integer>>();
ArrayList<ArrayList<Integer>> result = new ArrayList<ArrayList<Integer>>();
return permuteHelper(result, existLists, num, 0);
}

public void permuteHelper(ArrayList<ArrayList<Integer>> result, Set<ArrayList<Integer>> existLists, int[] num, int i) {
if(i<0) return;
if(i==num.length) {
ArrayList<Integer> newList = arrayToArrayList(num);
if(!existLists.contains(newList)) {
return;
}
}

for(int j=i;j<num.length; j++) {
swap(num, i,j);
permuteHelper(result, existLists, num, i+1);
swap(num, i,j);
}
return;
}

public void swap(int[] num, int i, int j) {
int tmp = num[i];
num[i]=num[j];
num[j]=tmp;
}

public ArrayList<Integer> arrayToArrayList(int[] num) {
ArrayList<Integer> result = new ArrayList<Integer>();
for(int i=0; i<num.length; i++) {
}
return result;
}
``````

}

above is my solution, when submitting to OJ, it has compiler error
Line 14: error: cannot find symbol: method permuteUnique(int[])
However, Line14 is: result.add(newList); didn't get where permuteUnique comes from?

• I think you need name your function "permuteUnique" to get recognized by OJ, so that OJ knows which function to call and test.

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