LeetCode - Rotate Array

Rotate Array

2015.4.17 05:37

Rotate an array of n elements to the right by k steps.

For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].

Note:
Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.

Solution:

　　Old problem, just solve it.

Accepted code:

// FAQ
#include <algorithm>
using namespace std;

class Solution {
public:
    void rotate(int nums[], int n, int k) {
        if (k < 0) {
            k = n - (n - k) % n;
        }
        k %= n;
        reverse(nums, nums + n - k);
        reverse(nums + n - k, nums + n);
        reverse(nums, nums + n);
    }
};