## 324. Wiggle Sort II

Given an integer array `nums`, reorder it such that `nums[0] < nums[1] > nums[2] < nums[3]...`.

You may assume the input array always has a valid answer.

Example 1:

```Input: nums = [1,5,1,1,6,4]
Output: [1,6,1,5,1,4]
Explanation: [1,4,1,5,1,6] is also accepted.
```

Example 2:

```Input: nums = [1,3,2,2,3,1]
Output: [2,3,1,3,1,2]
```

Constraints:

• `1 <= nums.length <= 5 * 104`
• `0 <= nums[i] <= 5000`
• It is guaranteed that there will be an answer for the given input `nums`.

Follow Up: Can you do it in `O(n)` time and/or in-place with `O(1)` extra space?

## Rust Solution

``````struct Solution;

impl Solution {
fn wiggle_sort(nums: &mut Vec<i32>) {
let n = nums.len();
let mut sorted = nums.to_vec();
sorted.sort_unstable();
let k = if n % 2 == 0 { n / 2 } else { n / 2 + 1 };
for i in 0..k {
nums[i * 2] = sorted[k - 1 - i];
}
for i in 0..(n - k) {
nums[i * 2 + 1] = sorted[n - 1 - i];
}
}
}

#[test]
fn test() {
let mut nums = vec![1, 5, 1, 1, 6, 4];
let res = vec![1, 6, 1, 5, 1, 4];
Solution::wiggle_sort(&mut nums);
assert_eq!(nums, res);
let mut nums = vec![1, 1, 2, 1, 2, 2, 1];
let res = vec![1, 2, 1, 2, 1, 2, 1];
Solution::wiggle_sort(&mut nums);
assert_eq!(nums, res);
let mut nums = vec![4, 5, 5, 6];
let res = vec![5, 6, 4, 5];
Solution::wiggle_sort(&mut nums);
assert_eq!(nums, res);
}
``````

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