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Solution.java

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public class Solution {

public ArrayList<ArrayList<Integer>> sol = new ArrayList<ArrayList<Integer>>();

public ArrayList<ArrayList<Integer>> permute(ArrayList<Integer> A) {

per(new ArrayList<Integer>(), A);

return sol;

}

public void per(ArrayList<Integer> current, ArrayList<Integer> rem) {

if (rem.size() == 0) { sol.add(current); return; }

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

ArrayList<Integer> cTmp = (ArrayList<Integer>) current.clone();

ArrayList<Integer> cRem = (ArrayList<Integer>) rem.clone();

cTmp.add(cRem.get(i));

cRem.remove(i);

per(cTmp, cRem);

}

}

}