use std::collections::HashMap;

pub fn repeated_n_times(a: Vec<i32>) -> i32 {
    let mut hm = HashMap::new();
    for i in a {
        if hm.contains_key(&i) {
            return i;
        } else {
            hm.insert(i, 0);
        }
    }
    return 0; // This is unecessary given the problem constraints, but rust needs it to be happy
}

pub fn main() {
    println!("Expected: 3");
    println!("Got: {}", repeated_n_times(vec![1 ,2, 3, 3]))
}