384. Shuffle an Array [Leetcode]

利用swap+随机数生成一个随机的序列。

class Solution {public:    Solution(vector<int> nums) {        srand(time(NULL));        this->originalNums = nums;        size = nums.size();    }    /** Resets the array to its original configuration and return it. */    vector<int> reset() {        return originalNums;    }    /** Returns a random shuffling of the array. */    vector<int> shuffle() {        vector<int> ShuffleNums(originalNums);        for (int i = 0; i < size; i++) {            swap(ShuffleNums[i], ShuffleNums[i + rand() % (size - i)]);        }        return ShuffleNums;    }private:    vector<int> originalNums;    int size;};/** * Your Solution object will be instantiated and called as such: * Solution obj = new Solution(nums); * vector<int> param_1 = obj.reset(); * vector<int> param_2 = obj.shuffle(); */