class Solution
{
    int[] buildArray(int[] nums)
    {
        int[] arr = new int[nums.length];

        for (int i = nums.length; i > 0; --i)
        {
            arr[i - 1] = nums[nums[i - 1]];
        }

        return arr;
    }

    void test()
    {
        int[][] testInputs = {
            {0, 2, 1, 5, 3, 4},
            {0, 1, 2, 4, 5, 3}
        };
        int[][] testOutputs = {
            {0, 1, 2, 4, 5, 3},
            {4, 5, 0, 1, 2, 3}
        };
        for (int i = 0; i < testInputs.length; i++) {
            int[] testInput = testInputs[i];
            int[] testOutput = testOutputs[i];
            int[] testcase = buildArray(testInput);
            for (int j = 0; j < testInput.length; j++) {
                assert testcase[j] == testOutput[j];
            }
        }
    }

    public static void main(String[] args)
    {
        new Solution().test();
    }
}