advent-of-code/2022/19-Not-Enough-Minerals/priority_queue.js
2022-12-28 20:04:09 +01:00

39 lines
766 B
JavaScript

export class QElement {
constructor(element, priority) {
this.element = element;
this.priority = priority;
}
}
export class PriorityQueue {
constructor(elt) {
this.items = [];
if (elt !== undefined) {
this.enqueue(elt, 0);
}
}
enqueue(element, priority) {
let qElement = new QElement(element, priority);
for (let i = 0; i < this.items.length; ++i) {
if (this.items[i].priority > qElement.priority) {
this.items.splice(i, 0, qElement);
return;
}
}
this.items.push(qElement);
}
dequeue() {
return this.items.pop(); // pop highest priority, use shift() for lower priority
}
front() {
return this.items[0];
}
rear() {
return this.items[this.items.length - 1];
}
isEmpty() {
return this.items.length === 0;
}
}