use std::cmp::max;

struct Solution;
impl Solution {
    pub fn does_valid_array_exist(derived: Vec<i32>) -> bool {
        let mut a = 0;
        let mut b = 1;
        for i in derived.iter() {
            a ^= i;
            b ^= i;
        }
        a == 0 || b == 1
    }
}

fn main() {
    let sl = Solution::does_valid_array_exist(vec![1,1,0]);
    println!("{:?}", sl);
}