Struct advent_of_code_2022::day_6::Counts

struct Counts {
    counts: HashMap<char, usize>,
}

Represents a window of characters over a data stream by their counts

Fields

counts: HashMap<char, usize>

Implementations

impl Counts

fn new(init: &str) -> Self

Create a Counts instance for the first window in the stream

fn add_and_remove(&mut self, to_add: &char, to_remove: &char)

Advance the window by one character by adding the next character in the stream and removing the one that falls out.

fn add(&mut self, to_add: &char)

Increment the count for to_add - adding it to the map if new

fn remove(&mut self, to_remove: &char)

Decrement the count for to_remove - remove from the map if the count is now 0

fn len(&self) -> usize

The number of unique characters in the map is the same as its length