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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
nums
are unique.104
calls in total will be made to reset
and shuffle
.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;
}
}
class Solution(object):
def __init__(self, nums):
self.reset = lambda: nums
self.shuffle = lambda: random.sample(nums, len(nums))
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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