During the development process, queue is a very practical data structure. When using queues, you may encounter some problems, such as how to implement no repeat queue.
In many scenarios, we need to add elements to the queue, but if the element already exists in the queue, we need to ignore it to avoid adding duplicate elements. At this time, we need to use a non-duplicate queue.
In Golang, we can use map to implement non-duplicate queues. Specifically, we can put elements into a map as keys, and the values can be set to true or any other value. If the key already exists in the map, we can ignore it. Otherwise, we can add the element to the queue.
The following is a sample code that uses map to implement a non-duplicate queue:
type uniqueQueue struct { items map[string]bool queue []string } func newUniqueQueue() *uniqueQueue { return &uniqueQueue{ items: make(map[string]bool), queue: []string{}, } } func (q *uniqueQueue) enqueue(item string) { if !q.items[item] { q.items[item] = true q.queue = append(q.queue, item) } } func (q *uniqueQueue) dequeue() string { item := q.queue[0] q.queue = q.queue[1:] delete(q.items, item) return item } func (q *uniqueQueue) isEmpty() bool { return len(q.queue) == 0 }
In the above code, we define a type called uniqueQueue
, which contains A map of items
and an array of queue
. items
is used to save the elements that already exist in the queue, and queue
is used to save the order of elements in the queue.
We implement the function of adding elements to the queue in the enqueue
method. When adding an element, we first need to determine whether the element exists in items
. If it does not exist, we can add the element to queue
and set the corresponding value of the element in items
to true. Otherwise, we need to ignore the element.
In the dequeue
method, we implement the function of removing elements from the queue. Specifically, we remove the first element from the queue and delete the element from items
. Finally, we return the removed element.
In the isEmpty
method, we determine whether the queue is empty. This method returns true if there are no elements in the queue.
Using the above code, we can easily implement non-duplicate queues and avoid the appearance of duplicate elements, thus improving the efficiency and performance of the code.
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