Data Structures Quiz 2
What is a Queue
- A restricted access linear data structure - Items are removed in the order they are added - FIFO
Applications of Stacks:
- Evaluating expressions and parsing syntax - Balancing delimiters in program code - Converting numbers between bases - Processing financial data - Backtracking algorithms
How is a Queue different than a Stack?
- In a queue, both ends are involved. Additions are restricted to one end (the rear) and deletions to the other end (the front)
What data members does a stack need?
- List of items - Length - Max size
What is a Stack?
- a restricted linear data structure - LIFO - can only be accessed at one of its ends for adding and removing elements - Stacks are lists w/ restricted insertion and removal
What information does the activation record, or stack frame, contain?
- values of the function's parameters, addresses of reference variables - copies of local variables - the return address of the calling function - A dynamic link to the calling function's activation record - the function's return value if it is not void
For recursion the following must be true:
1. There must be some base condition for which the subprogram does not call itself 2. Each time the subprogram calls itself, it must converge on the base condition
What is a search table?
A dictionary implemented by means of a sorted sequence
What is Recursion?
A problem-solving approach in which a problem is solved by repeatedly applying the same solution to smaller instances
Binary search best-case time complexity:
O(1) - when target element happens to be in the middle of the array
Linear search time complexity, best case?
O(1) - when the target element v is the first element in the array
Binary search average-case time complexity:
O(log n)
Binary search worst-case time complexity:
O(log n)
Linear search time complexity, average case?
O(n) - if the target is somewhere in the middle of the array
What does the fact that in recursion the sub-problem is of the same form as the original mean to the programmer?
The function can call itself to solve it
How can one implement a Stack?
Using an array, a vector, or a linked list
Linear search time complexity, worst case?
Worst-case: O(n) - if v does not exist or if v is the last element in the array
