题目：

题解：

class Solution {
public:Solution(vector<int>& nums) {this->nums = nums;this->original.resize(nums.size());copy(nums.begin(), nums.end(), original.begin());}vector<int> reset() {copy(original.begin(), original.end(), nums.begin());return nums;}vector<int> shuffle() {for (int i = 0; i < nums.size(); ++i) {int j = i + rand() % (nums.size() - i);swap(nums[i], nums[j]);}return nums;}
private:vector<int> nums;vector<int> original;
};