Module 4: Final project and assessment: Data structures and algorithms

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In this post, I provide accurate answers and detailed explanations for Module 4: Final project and assessment: Data structures and algorithms of Course 3: Data Structures and Algorithms – Amazon Junior Software Developer Professional Certificate.

Whether you’re preparing for quizzes or brushing up on your knowledge, these insights will help you master the concepts effectively. Let’s dive into the correct answers and detailed explanations for each question.

Course quiz: Data structures and algorithms

Practice Assignment

  • int temperatures = new int[7];
  • int[] temperatures = int[7];
  • int[] temperatures = new int[7];
  • int temperatures[7] = new int();

1. You are developing a weather prediction system that needs to store daily temperature values for a week. Which of the following correctly declares an array to store daily temperatures?

2. You're tasked with developing a to-do list application that manages tasks using an ArrayList. Which method would you use to remove a task named "Buy Groceries"?

  • tasks.delete(“Buy Groceries”);
  • tasks.clear(“Buy Groceries”);
  • tasks.remove(“Buy Groceries”);
  • tasks.pop(“Buy Groceries”);

3. You need to find the index of the number 15 in a sorted array of integers. Given the sorted array int[] sortedArray = {1, 5, 10, 15, 20};, which of the following code snippets correctly performs a binary search for the number 15?

  •  

4. Which code snippet correctly checks for balanced parentheses in the string "{[()]}" using a stack?

  •  

5. What is the most efficient way to add a new node at the beginning of a singly linked list?

  • Set the new node’s next reference to the current head and update the head to the new node.
  • Traverse to the end of the list and then insert the node.
  • Traverse to the middle of the list and insert the node there.
  • Set the current tail’s next reference to the new node.

6. What is a characteristic of a doubly linked list that a singly linked list does not have?

  • Nodes contain references to the next node only.
  • Nodes are stored in contiguous memory locations.
  • Each node has two references: one to the next node and one to the previous node.
  • It can only be traversed in one direction.

7. In a HashMap map, you want to update the value associated with the key id only if the key already exists. Which method would you use?

  • map.containsKey(“id”, newValue);
  • map.update(“id”, newValue);
  • map.put(“id”, newValue);
  • *A:map.replace(“id”, newValue);

8. What does the assertEquals method do in JUnit?

  • Compares two integers.
  • Checks if a collection is empty.
  • Asserts that two values are equal.
  • Throws an exception.

9. Which sorting algorithm is not suitable for very large datasets due to its quadratic time complexity?

  • Merge Sort
  • Quick Sort
  • Insertion Sort
  • Heap Sort

10. How does Merge Sort operate?

  • It repeatedly selects the smallest element and moves it to the beginning.
  • It divides the array into halves, sorts each half, and then merges them.
  • It swaps adjacent elements if they are in the wrong order.
  • It partitions the array around a pivot element.

11. How can the worst-case scenario for Quick Sort be avoided?

  • Always choose the first element as a pivot.
  • Increase the size of the array.
  • Use randomization or the “median of three” strategy.
  • Use a recursive function with a higher depth.

12. In a sorted array of 1000 elements, how many comparisons would binary search take in the worst case?

  • 1
  • 10
  • 100
  • 1000

13. Which method is used to retrieve the greatest key less than or equal to the given key in a TreeMap?

  • map.floorEntry(K key);
  • map.ceilingEntry(K key);
  • map.lowerEntry(K key);
  • map.higherEntry(K key);

14. What is a key characteristic of a LinkedHashMap compared to a HashMap?

  • It maintains insertion order of elements.
  • It sorts elements in descending order.
  • It allows duplicate keys.
  • It does not permit null keys.

15. True or False: In a doubly linked list, theremoveFirst() method deletes the first node by setting the prev reference of the second node to null.

  • True
  • False

Related contents:

Module 1: Data structures
Module 2: Searching and sorting algorithms
Module 3: Basic Testing

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