use std::collections::HashMap;

pub fn unique_occurrences(arr: Vec<i32>) -> bool {
    let mut hm = HashMap::<i32, i32>::new();
    for n in arr {
        let count = hm.entry(n).or_insert(0);
        *count += 1;
    }
    let mut vals: Vec<&i32> = hm.values().collect();
    vals.sort();
    let og_length = vals.len();
    vals.dedup_by_key(|i| *i);
    let new_length = vals.len();
    og_length == new_length
}

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