Question

Suppose that an initially empty queue performs the following operations. enqueue(7), enqueue(3), dequeue(), front(), enqueue(8), enqueue(5), front(), enqueue(4), dequeue(), enqueue(0), dequeue(), dequeue() List, in order, the values that are returned. Give your answer as a single multi-digit number, where each digit represents a single returned value. For example, if the operations returned 3, 1, 4, 1, 5, 9, and 2, in that order, then the answer would be 3141592. (The format 3,141,592 would also be fine.)

Answer 1

Answer:

The answer is 733385.

Explanation:

The operations being performed on the queue are as follows:

• enqueue(x): Inserts the element x into the queue. The element is inserted at the end of the queue. This operation returns nothing.
• front(): Returns the element present at the front of the queue.
• dequeue(): Deletes the element present at the front of the queue and returns it.

Perform the given operations to obtain the values returned after each operation. The operations being performed are as follows:

• enqueue(7): Inserts 7 into the queue. (Nothing is returned)
• enqueue(3): Inserts 3 into the queue. (Nothing is returned)

• The queue is now as follows:

• dequeue(): Removes the element present at the front of the queue, that is 7, and returns it. (The returned value is 7)

• The queue is now as follows:

• front(): Returns the element present at the front of the queue, that is 3. (The returned value is 3)
• enqueue(8): Inserts 8 into the queue. (Nothing is returned)
• enqueue(5): Inserts 5 into the queue. (Nothing is returned)
• The queue is now as follows:

• front(): Returns the element present at the front of the queue, that is, 3. (The returned value is 3)
• enqueue(4): Inserts 4 into the queue. (Nothing is returned)
• The queue is now as follows:

• dequeue(): Removes the element present at the front of the queue, that is 3, and returns it. (The returned value is 3)
• The queue is now as follows:

• 
• enqueue(0): Inserts 0 into the queue. (Nothing is returned)
• The queue is now as follows:

• dequeue() : Remove the element present at the front of the list, that is 8, and returns it. (The returned value is 8)
• The queue is now as follows:

• dequeue(): Removes the element present at the front of the list, that is 5, and returns it. (The returned value is 5)
• The queue is now as follows:
• ‘

• No more operations are performed.
• So, the values returned by the operations were, 7,3,3,3,8,5.

Hence, the answer is 733385.