题目：

题解：

type Solution struct {nums, original []int
}func Constructor(nums []int) Solution {return Solution{nums, append([]int(nil), nums...)}
}func (s *Solution) Reset() []int {copy(s.nums, s.original)return s.nums
}func (s *Solution) Shuffle() []int {n := len(s.nums)for i := range s.nums {j := i + rand.Intn(n-i)s.nums[i], s.nums[j] = s.nums[j], s.nums[i]}return s.nums
}