rust sort vector of number descending

To sort a vector of numbers in descending order in Rust, you can use the sort method from the Vec type, along with a custom comparison function. Here's an example:

fn main() {
    let mut numbers = vec![5, 2, 8, 1, 9];
    numbers.sort_by(|a, b| b.cmp(a));
    println!("{:?}", numbers);
}

This will output [9, 8, 5, 2, 1], which is the vector sorted in descending order. The sort_by method takes a closure that defines the comparison between elements. In this case, we use the cmp method to compare the elements in reverse order (b.cmp(a)).