JavaScript Coding Test Course, Sorting Numbers 2

JavaScript Coding Test Course – Sorting Numbers 2

In this course, we will deeply analyze the algorithm problem called ‘Sorting Numbers 2’ and explain the step-by-step process to solve it. We will look into how to solve the problem using JavaScript along with its definition.

Problem Definition

The problem is as follows. Given a set of numbers, write a program to sort these numbers in ascending order. Please note that the number of inputs can be up to 10,000. Below, we will provide the exact input and output formats along with examples.

Input

The first line contains the number of integers N (1 ≤ N ≤ 10,000). Then, N lines follow, each containing a single integer. This integer will be between -1,000,000 and 1,000,000, inclusive.

Output

The integers received as input must be printed in ascending order, one per line.

Example Input

Example Output

Problem Approach

The key to this problem is sorting the N given integers. There are many methods available, but it is important to choose an efficient sorting algorithm. In JavaScript, you can typically use the Array.sort() method.

The Array.sort() method performs string sorting by default, so a comparison function is necessary to sort actual numbers. Care is needed when using the built-in sort() method in JavaScript, especially considering time complexity when processing a large amount of numbers.

Solution Method

Let’s step through the process of solving the problem.

Prepare the input data.

First, you need to declare variables necessary for reading the input data presented by the problem and store the data in an array. At this time, we will use JavaScript’s Array to store the numbers dynamically.
Sort the input numbers.

Use the Array.sort() method to sort the input array. Define a comparison function to allow for number comparison.
Output the sorted numbers.

Use a function or method to print the values of the sorted array, outputting one number per line.

JavaScript Code Implementation

Based on the solution methods mentioned above, the JavaScript code can be implemented as follows:


function sortNumbers(input) {
  const N = parseInt(input[0]); // The first line is the number of integers
  const numbers = input.slice(1, N + 1).map(Number); // Convert the remaining N numbers to integers and store in an array

  numbers.sort((a, b) => a - b); // Sort in ascending order

  return numbers.join('\\n'); // Return sorted numbers to print one per line
}

// Example input
const input = [
  '5',
  '5',
  '3',
  '2',
  '1',
  '4'
];

console.log(sortNumbers(input)); // Output the result

Code Explanation

Let us look more closely at each part of the code:

Input Handling: parseInt(input[0]) is used to retrieve the number of integers from the first line. input.slice(1, N + 1) selects the numbers excluding the first line, and map(Number) converts the string array to a number array.
Sorting: numbers.sort((a, b) => a - b) compares two numbers and sorts them in ascending order. It returns a - b so that if the first argument is less than the second, it returns a negative number, if greater, a positive number, and if equal, 0.
Output Handling: join('\\n') connects each element of the array with a newline character to create a string that can be printed.

Test Cases

You can consider several test cases using the defined code:

Test Case 1

Input:
5
5
3
2
1
4

Output:
1
2
3
4
5

Test Case 2

Input:
4
10
30
20
40

Output:
10
20
30
40

Test Case 3

Input:
3
-1
-5
2

Output:
-5
-1
2

Final Words

In this course, we have learned how to solve the algorithm problem ‘Sorting Numbers 2’. Various sorting algorithms can be utilized, but it is essential to select an appropriate algorithm based on the scope and requirements of the problem. Furthermore, leveraging JavaScript’s powerful features allows for efficient implementation.

We will continue to share methods for solving various algorithm problems, so please stay tuned. Enhance your skills in well-organized problem-solving to open the door to employment!