fn main()

in contests/abc073/abc073_c.rs [7:24]

• 15 lines of code
• 3 McCabe index (conditional complexity)

fn main() {
    input! {
        N: usize,
        A: [u64; N]
    }

    let mut paper: HashMap<u64, bool> = HashMap::new();

    for a in A {
        if paper.contains_key(&a) {
            paper.remove(&a);
        } else {
            paper.insert(a, true);
        }
    }

    println!("{}", paper.len())
}