fn main() {
    println!("Hello, world!");
}

struct Solution;

impl Solution {
    pub fn find_lonely(mut nums: Vec<i32>) -> Vec<i32> {
        if nums.len() == 1 {return nums;}

        nums.sort();

        let mut result: Vec<i32> = nums.windows(3).filter(|arr| (arr[0] - arr[1]).abs() > 1).flat_map(|arr| Vec::from(arr)).collect();
        result.dedup();
        result
    }
}