13 lines
361 B
Rust
13 lines
361 B
Rust
use std::collections::{HashMap, HashSet};
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impl Solution {
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pub fn unique_occurrences(arr: Vec<i32>) -> bool {
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// count frequencies
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let mut freqs: HashMap<i32, i32> = HashMap::new();
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for x in &arr {
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*freqs.entry(*x).or_insert(0) += 1;
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}
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freqs.values().collect::<HashSet<_>>().len() == freqs.len()
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}
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}
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