hash_map_count.rs

hash_map_count.rs

use std::collections::HashMap;
use std::hash::{Hash, Hasher};

fn main() {
    let mut counts = HashMap::new();

    for i in 0..=144 {
        let hash = hash_value(&i);
        println!("{}",hash);
        *counts.entry(hash).or_insert(0) += 1;
    }

    println!("{:?}", counts);
}

fn hash_value<T: Hash>(t: &T) -> u64 {
    let mut s = std::hash::SipHasher::new();
    t.hash(&mut s);
    s.finish()
}