Which of the following are necessary parts of all recursive methods?A tail call.Tail-call optimization.}Backtracking.One or more base cases.One or more recursive calls.Select all true statements about the method below:private static int sumEveryThird (int sum, int num) {if(num== 0) {return sum;}else {}return sumEveryThird (sum + num, num-3);The method may cause Stack Overflow error on some inputs.The method contains one base case and one recursive call.The method is recursive.The method has a tail call.The method will always cause Stack Overflow error.Consider the following problem:Maximum Potato HaulA square n x n grid represents a potato field, and each cell in this 'field" has an integer representing the number of potatoes in thatcell, or o if it there are none (cell is empty).Return the maximum number of potatoes you can collect under these conditions:• Every time you are located in a cell you will collect all the potatoes in that cell.• From your position, you can walk one step to the left, right, up, or down provided you stay on the grid.• You can't visit the same cell more than once.You can never visit a cell with o potatoes (empty cell).• You can start and stop collecting potatoes from any position in the grid that is not empty.You do not have to solve the Maximum Potato Haul problem (although it would make for great interviewpractice!) but you should recognize some features of it.Now select all true statements about this problem:The only way to solve this problem is to use recursion.There is a non-recursive solution to this problem.Since current location on the field/grid is a key element of the solution, using the data structure Map is helpful.This problem can be solved using recursion with backtracking.There is a O(n) solution to this problem where n is the number of potatoes on the grid.

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Answered: Which of the following are necessary…

Which of the following are necessary parts of all recursive methods? A tail call. Tail-call optimization. Backtracking. One or more base cases. One or more recursive calls.

Database System Concepts

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Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Computational Systems

The computation systems can be defined as the systems that are capable of solving a problem that includes calculations either mathematical or logical, and are able to produce the result as an output. For example, a simple calculator that is given a set of numbers and operators as input and produces the result as an output can be defined as a computational system. The above example is a simple illustration only, the computational systems range from simple devices to complex devices such as the systems that control the SpaceX companies, Starlink satellites which are being quite recently seen in the skies at many places globally.

Question

Which of the following are necessary parts of all recursive methods?
A tail call.
Tail-call optimization.
}
Backtracking.
One or more base cases.
One or more recursive calls.
Select all true statements about the method below:
private static int sumEveryThird (int sum, int num) {
if(num== 0) {
return sum;
}
else {
}
return sumEveryThird (sum + num, num-3);
The method may cause Stack Overflow error on some inputs.
The method contains one base case and one recursive call.
The method is recursive.
The method has a tail call.
The method will always cause Stack Overflow error.
Consider the following problem:
Maximum Potato Haul
A square n x n grid represents a potato field, and each cell in this 'field" has an integer representing the number of potatoes in that
cell, or o if it there are none (cell is empty).
Return the maximum number of potatoes you can collect under these conditions:
• Every time you are located in a cell you will collect all the potatoes in that cell.
• From your position, you can walk one step to the left, right, up, or down provided you stay on the grid.
• You can't visit the same cell more than once.
You can never visit a cell with o potatoes (empty cell).
• You can start and stop collecting potatoes from any position in the grid that is not empty.
You do not have to solve the Maximum Potato Haul problem (although it would make for great interview
practice!) but you should recognize some features of it.
Now select all true statements about this problem:
The only way to solve this problem is to use recursion.
There is a non-recursive solution to this problem.
Since current location on the field/grid is a key element of the solution, using the data structure Map is helpful.
This problem can be solved using recursion with backtracking.
There is a O(n) solution to this problem where n is the number of potatoes on the grid.

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