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1use std::collections::HashMap;23fn word_freq(text: &str) -> HashMap<&str, usize> {4    let mut counts = HashMap::new();5    for word in text.split_whitespace() {6        *counts.entry(word).or_insert(0) += 1;7    }8    counts9}1011fn top_n<'a>(12    counts: &'a HashMap<&str, usize>,13    n: usize,14) -> Vec<(&&'a str, &'a usize)> {15    let mut pairs: Vec<_> = counts.iter().collect();16    pairs.sort_unstable_by(|a, b| b.1.cmp(a.1));17    pairs.into_iter().take(n).collect()18}1920fn main() {21    let text = "the quick brown fox jumps over the lazy dog the fox";22    let counts = word_freq(text);23    for (word, count) in top_n(&counts, 3) {24        println!("{word}: {count}");25    }26}