rust_test/src/main.rs

struct Solution;
impl Solution {
    pub fn max_sum(mut nums: Vec<i32>) -> i32 {
        nums.sort_by(|a,b| b.cmp(a));
        let mut last = nums[0];
        let mut ans = nums[0];
        for i in 1..nums.len() {
            let t = nums[i];
            if t <= 0 {
                break
            }
            if t == last {
                continue;
            }
            last = t;
            ans += t;
        }
        ans
    }
}

fn main() {
    let sl = Solution::max_sum(vec![-1,-2]);
    println!("{}", sl);
}