384.cpp

// WTF.cpp
class Solution {
  vector<int> arr;

public:
  Solution(vector<int> nums) { arr = nums; }

  /** Resets the array to its original configuration and return it. */
  vector<int> reset() { return arr; }

  /** Returns a random shuffling of the array. */
  vector<int> shuffle() {
    vector<int> result(arr);
    int n = result.size();
    for (int i = 0; i < n; i++) {
      int pos = rand() % n;
      swap(result[pos], result[i]);
    }
    return result;
  }
};

/**
 * Your Solution object will be instantiated and called as such:
 * Solution obj = new Solution(nums);
 * vector<int> param_1 = obj.reset();
 * vector<int> param_2 = obj.shuffle();
 */