189. Rotate Array
Given an array, rotate the array to the right by k steps, where k is non-negative.
Follow up:
- Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.
- Could you do it in-place with O(1) extra space?
Example 1:
Input: nums = [1,2,3,4,5,6,7], k = 3 Output: [5,6,7,1,2,3,4] Explanation: rotate 1 steps to the right: [7,1,2,3,4,5,6] rotate 2 steps to the right: [6,7,1,2,3,4,5] rotate 3 steps to the right: [5,6,7,1,2,3,4]
Example 2:
Input: nums = [-1,-100,3,99], k = 2 Output: [3,99,-1,-100] Explanation: rotate 1 steps to the right: [99,-1,-100,3] rotate 2 steps to the right: [3,99,-1,-100]
Constraints:
1 <= nums.length <= 2 * 104-231 <= nums[i] <= 231 - 10 <= k <= 105
Rust Solution
struct Solution;
impl Solution {
fn rotate(nums: &mut Vec<i32>, k: i32) {
let k = k as usize % nums.len();
nums[..].reverse();
nums[0..k].reverse();
nums[k..].reverse();
// nums.rotate_right(k);
}
}
#[test]
fn test() {
let mut nums = vec![1, 2, 3, 4, 5, 6, 7];
Solution::rotate(&mut nums, 3);
assert_eq!(nums, vec![5, 6, 7, 1, 2, 3, 4]);
}
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