Resizing the array involves creating a new array and copying all elements, which takes O(n) time.

The enqueue operation in a circular queue can be performed in constant time O(1) as long as there is space available.

The pop operation in a stack implemented using a dynamic array takes O(1) time, as it simply removes the top element.

Accessing the front element of a queue implemented using a linked list takes O(1) time, as it points directly to the head of the list.

Searching for an element in a queue implemented using an array requires checking each element, resulting in a time complexity of O(n).

Reversing a string using a stack involves pushing each character onto the stack and then popping them off, resulting in a time complexity of O(n).