What is the time complexity of reversing a queue using a stack?
Practice Questions
Q1
What is the time complexity of reversing a queue using a stack?
O(n)
O(n log n)
O(n^2)
O(1)
Questions & Step-by-Step Solutions
What is the time complexity of reversing a queue using a stack?
Step 1: Understand that a queue is a data structure that follows the First In First Out (FIFO) principle, meaning the first element added is the first one to be removed.
Step 2: Understand that a stack is a data structure that follows the Last In First Out (LIFO) principle, meaning the last element added is the first one to be removed.
Step 3: To reverse a queue, we need to move all elements from the queue to the stack. This requires going through each element in the queue once.
Step 4: After all elements are in the stack, we then need to move them back to the queue. This also requires going through each element in the stack once.
Step 5: Since we go through all n elements of the queue twice (once to the stack and once back to the queue), the total number of operations is proportional to n.
Step 6: Therefore, the time complexity of reversing a queue using a stack is O(n).
