189. Rotate Array
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].
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
| class Solution {
public void rotate(int[] nums, int k) {
if(k<=0)
return ;
k = k%nums.length;
reverse(nums, 0, nums.length-k-1);
reverse(nums, nums.length-k, nums.length-1);
reverse(nums, 0, nums.length-1);
}
public void reverse(int[] nums, int i, int j){
while(i<j){
int temp = nums[i];
nums[i] = nums[j];
nums[j] = temp;
i++;
j--;
}
}
}
|
