Contains Duplicateeasy

use std::collections::HashSet;

fn contains_duplicate(nums: Vec<i32>) -> bool {
    // TODO: return true if any value appears more than once
    false
}

fn main() {
    println!("{}", contains_duplicate(vec![1, 2, 3, 1])); // true
    println!("{}", contains_duplicate(vec![1, 2, 3, 4])); // false
}