Реализуйте очередь на обычном списке. Даны операции operations: ["enqueue", v], ["dequeue"] или ["front"]. Верните список результатов операций dequeue и front по порядку (-1, если очередь пуста).
| Вход | Ожидаемый результат |
|---|
| [[["enqueue", 1], ["enqueue", 2], ["dequeue"], ["front"], ["dequeue"], ["dequeue"]]] | [1, 2, 2, -1] |
| [[["dequeue"]]] | [-1] |
| [[["front"]]] | [-1] |
| [[["enqueue", 5], ["front"], ["dequeue"]]] | [5, 5] |
| [[["enqueue", 1], ["enqueue", 2], ["enqueue", 3], ["dequeue"], ["dequeue"], ["dequeue"], ["dequeue"]]] | [1, 2, 3, -1] |
| [[["enqueue", 0], ["dequeue"], ["dequeue"]]] | [0, -1] |
| [[["enqueue", 10], ["enqueue", 20], ["front"]]] | [10] |
| [[["enqueue", 1]]] | [] |
| [[["enqueue", 1], ["enqueue", 2], ["front"], ["front"]]] | [1, 1] |
| [[["dequeue"], ["enqueue", 7], ["dequeue"]]] | [-1, 7] |