Daily Coding Problem: Problem #1700 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by Google.

A quack is a data structure combining properties of both stacks and queues. It can be viewed as a list of elements written left to right such that three operations are possible:

• push(x): add a new item x to the left end of the list
• pop(): remove and return the item on the left end of the list
• pull(): remove the item on the right end of the list.

Implement a quack using three stacks and O(1) additional memory, so that the amortized time for any push, pop, or pull operation is O(1).

Upgrade to premium and get in-depth solutions to every problem, including this one. Since you were referred by one of our affiliates, you'll get a 10% discount on checkout!

If you liked this problem, feel free to forward it along so they can subscribe here! As always, shoot us an email if there's anything we can help with!

Practice makes perfect. Book a mock interview with a FAANG-level interviewer today from our friends at Exponent (10% off!).

System design interviews are becoming more popular in SWE interviews. Here's how to prepare.

No more? Snooze or unsubscribe.