Leetcode 384. Shuffle an Array (Medium) (cpp)
Difficulty: Medium
/*
384. Shuffle an Array (Medium)
Shuffle a set of numbers without duplicates.
Example:
// Init an array with set 1, 2, and 3.
int[] nums = {1,2,3};
Solution solution = new Solution(nums);
// Shuffle the array [1,2,3] and return its result. Any permutation of [1,2,3] must equally likely to be returned.
solution.shuffle();
// Resets the array back to its original configuration [1,2,3].
solution.reset();
// Returns the random shuffling of array [1,2,3].
solution.shuffle();
*/
class Solution {
public:
vector<int> original, shuffled;
Solution(vector<int> nums) {
original = nums;
shuffled = nums;
}
/** Resets the array to its original configuration and return it. */
vector<int> reset() {
return original;
}
/** Returns a random shuffling of the array. */
vector<int> shuffle() {
for (int i = 0; i < shuffled.size(); i++) {
int index = rand() % (shuffled.size() - i);
swap(shuffled[i], shuffled[index + i]);
}
return shuffled;
}
};
/**
* 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();
*/