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CS2 Final Exam Practice Test Results - Extended Study questions with correct answers.
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CS2 Final Exam Practice Test Results -Extended Study questions with correct
answers
Do Test 2 Study Guide in Quizlet! - correct answer -
How would you write a recursive method for the Fibonacci sequence? public static long fib(int n) -
correct answer -public static long fib(int n)
{
if (n <= 2) { return 1; }
else
{ return fib(n - 1) + fib(n - 2); }
}
write a code that return the recursive sum of the numbers between 0 and x: - correct answer -import
java.util.*;
public class sumDemo
{
private long k;
public long sumIt(long n)
{
if(n==0){
return k;}
k+=n;
return sumIt(--n);
}
public static void main (String[] args)
, {
sumDemo sum1 = new sumDemo();
sum1.sumIt(18);
}
}
What is the relationship between binary search trees and red & black trees? - correct answer -Red &
Black trees are a special kind of Binary search tree, that balances itself.
What are the 5 properties of red & black trees? - correct answer -1) Every node is colored red or black
2) The root is black
3) A red node cannot have a re child ("No double reds rule")
4) All paths from the root to a nut have the same number of black nodes ("Equal exit costs rule")
5) It must be a binary search tree
What is the time efficiency of the red and black trees? - correct answer -O(log(n))
What is a heap? - correct answer -A binary tree with 2 properties
What are the properties of a heap? - correct answer -1) A heap is an almost full binary tree except the
last level
2) All descendants of the nodes have values that are at least as large as the parent node value. Know as
the heap property.
Is the heap a tree, binary tree or a binary search tree? - correct answer -binary tree
What is Random Access Memory? - correct answer -Accessing specific locations in a file and change only
those locations.
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