题目
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].
答案
class Solution {
private void reverse(int[] nums, int left, int right) {
while(left < right) {
int t = nums[left];
nums[left++] = nums[right];
nums[right--] = t;
}
}
public void rotate(int[] nums, int k) {
k = k % nums.length;
if(k == 0) return;
reverse(nums, 0, nums.length - 1);
reverse(nums, 0, k - 1);
reverse(nums, k, nums.length - 1);
}
}
