add: leetcode 0384 solution

Author: tphyhFighting

leetcode/0384.Shuffle-an-Array/384.Shuffle an Array.go

@@ -0,0 +1,28 @@
+package leetcode
+
+import "math/rand"
+
+type Solution struct {
+	nums []int
+}
+
+func Constructor(nums []int) Solution {
+	return Solution{
+		nums: nums,
+	}
+}
+
+/** Resets the array to its original configuration and return it. */
+func (this *Solution) Reset() []int {
+	return this.nums
+}
+
+/** Returns a random shuffling of the array. */
+func (this *Solution) Shuffle() []int {
+	arr := make([]int, len(this.nums))
+	copy(arr, this.nums)
+	rand.Shuffle(len(arr), func(i, j int) {
+		arr[i], arr[j] = arr[j], arr[i]
+	})
+	return arr
+}