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int[] powersOfTwo(int n) {
    List<Integer> res = new ArrayList<>();
    int i = 0;
    while (n!= 0) {
        if (n%2 != 0) res.add((int)Math.pow(2, i));
        n /=2;
        i++;
    }
    int[] ress = new int[res.size()];
    int j = 0; 
    for (Integer c : res) ress[j++] = c;
    return ress;
}