/// Counts the number of occurrences of duplicate items in the iterator.
Counts the number of occurrences of duplicate items in the iterator.
Counts the number of occurrences of duplicate items in the iterator .
fn count_duplicates(elements: impl Iterator<Item = String>) -> HashMap<String, usize> {
    let mut counts = HashMap::new();
    for element in elements {
        *counts.entry(element).or_insert(0) += 1;
    }
    counts
}
fn count_duplicates ( elements : impl Iterator < Item = String > ) -> HashMap < String , usize > { let mut counts = HashMap :: new ( ) ; for element in elements { * counts . entry ( element ) . or_insert ( 0 ) += 1 ; } counts }
Counts the number of occurrences of duplicate items in the iterator.
Counts the number of occurrences of duplicate items in the iterator .
elements
impl Iterator<Item = String>