pub struct Solution;
impl Solution {
    pub fn generate_parenthesis(n: i32) -> Vec<String> {
        
        return vec![];
    }
}

#[test]
fn test1() {
    let mut actual = Solution::generate_parenthesis(3);
    actual.sort();
    assert_eq!(actual, vec!["((()))","(()())","(())()","()(())","()()()"]);
}