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# Shuffle an Array LeetCode Solution

## Problem – Shuffle an Array

Given an integer array `nums`, design an algorithm to randomly shuffle the array. All permutations of the array should be equally likely as a result of the shuffling.

Implement the `Solution` class:

• `Solution(int[] nums)` Initializes the object with the integer array `nums`.
• `int[] reset()` Resets the array to its original configuration and returns it.
• `int[] shuffle()` Returns a random shuffling of the array.

Example 1:

``````Input
["Solution", "shuffle", "reset", "shuffle"]
[[[1, 2, 3]], [], [], []]
Output
[null, [3, 1, 2], [1, 2, 3], [1, 3, 2]]

Explanation
Solution solution = new Solution([1, 2, 3]);
solution.shuffle();    // Shuffle the array [1,2,3] and return its result.
// Any permutation of [1,2,3] must be equally likely to be returned.
// Example: return [3, 1, 2]
solution.reset();      // Resets the array back to its original configuration [1,2,3]. Return [1, 2, 3]
solution.shuffle();    // Returns the random shuffling of array [1,2,3]. Example: return [1, 3, 2]``````

Constraints:

• `1 <= nums.length <= 50`
• `-106 <= nums[i] <= 106`
• All the elements of `nums` are unique.
• At most `104` calls in total will be made to `reset` and `shuffle`.

### Shuffle an Array LeetCode Solution in Java

``````import java.util.Random;

public class Solution {
private int[] nums;
private Random random;

public Solution(int[] nums) {
this.nums = nums;
random = new Random();
}

/** Resets the array to its original configuration and return it. */
public int[] reset() {
return nums;
}

/** Returns a random shuffling of the array. */
public int[] shuffle() {
if(nums == null) return null;
int[] a = nums.clone();
for(int j = 1; j < a.length; j++) {
int i = random.nextInt(j + 1);
swap(a, i, j);
}
return a;
}

private void swap(int[] a, int i, int j) {
int t = a[i];
a[i] = a[j];
a[j] = t;
}
}
``````

### Shuffle an Array LeetCode Solution in Python

``````class Solution(object):
def __init__(self, nums):
self.reset = lambda: nums
self.shuffle = lambda: random.sample(nums, len(nums))``````

### Shuffle an Array LeetCode Solution in C++

``````class Solution {
vector<int> nums;
public:
Solution(vector<int> nums) {
this->nums = nums;
}

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

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