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g0301_0400.s0384_shuffle_an_array.readme.md Maven / Gradle / Ivy

384\. Shuffle an Array

Medium

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 <= 200`
*   -106 <= nums[i] <= 106
*   All the elements of `nums` are **unique**.
*   At most 5 * 104 calls **in total** will be made to `reset` and `shuffle`.