public class Solution {
    private int[] _original;
    Random _randomGenerator;

    public Solution(int[] nums) {
        _original = new int[nums.Length];
        Array.Copy(nums, _original, nums.Length);
        _randomGenerator = new Random();
    }

    /** Resets the array to its original configuration and return it. */
    public int[] Reset() {
        int[] returnArray = new int[_original.Length];
        Array.Copy(_original, returnArray, _original.Length);
        return returnArray;
    }

    /** Returns a random shuffling of the array. */
    public int[] Shuffle() {
        int[] shuffled = new int[_original.Length];
        Array.Copy(_original, shuffled, _original.Length);
        for (int i = 0; i < shuffled.Length - 1; i++)
        {
            var rand = _randomGenerator.Next(i + 1, shuffled.Length - 1);
            var tmp = shuffled[i];
            shuffled[i] = shuffled[rand];
            shuffled[rand] = tmp;
        }

        return shuffled;
    }
}

/**
 * Your Solution object will be instantiated and called as such:
 * Solution obj = new Solution(nums);
 * int[] param_1 = obj.Reset();
 * int[] param_2 = obj.Shuffle();
 */