Hello Programmers/Coders, Today we are going to share solutions of Programming problems of 30 Days Of Code, HackerRank. At Each Problem with Successful submission with all Test Cases Passed, you will get an score or marks. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.
In this post, you will find the solution for Day 20: Sorting in Java-HackerRank Problem. We are providing the correct and tested solutions of coding problems present on HackerRank. If you are not able to solve any problem, then you can take help from our Blog/website.
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Link for the Problem – Day 20: Sorting β Hacker Rank Solution
Day 20: Sorting β Hacker Rank SolutionProblem:
Objective
Today, we’re discussing a simple sorting algorithm called Bubble Sort. Check out the Tutorial tab for learning materials and an instructional video!
Consider the following version of Bubble Sort:
for (int i = 0; i < n; i++) {
// Track number of elements swapped during a single array traversal
int numberOfSwaps = 0;
for (int j = 0; j < n - 1; j++) {
// Swap adjacent elements if they are in decreasing order
if (a[j] > a[j + 1]) {
swap(a[j], a[j + 1]);
numberOfSwaps++;
}
}
// If no elements were swapped during a traversal, array is sorted
if (numberOfSwaps == 0) {
break;
}
}
Task
Given an array, , of size distinct elements, sort the array in ascending order using the Bubble Sort algorithm above. Once sorted, print the following lines:
Array is sorted in numSwaps swaps.
where is the number of swaps that took place.First Element: firstElement
where is the first element in the sorted array.Last Element: lastElement
where is the last element in the sorted array.
Hint: To complete this challenge, you will need to add a variable that keeps a running tally of all swaps that occur during execution.
Example
original a: 4 3 1 2 round 1 a: 3 1 2 4 swaps this round: 3 round 2 a: 1 2 3 4 swaps this round: 2 round 3 a: 1 2 3 4 swaps this round: 0
In the first round, the is swapped at each of the comparisons, ending in the last position. In the second round, the is swapped at of the comparisons. Finally, in the third round, no swaps are made so the iterations stop. The output is the following:
Array is sorted in 5 swaps. First Element: 1 Last Element: 4
Input Format
The first line contains an integer, , the number of elements in array .
The second line contains space-separated integers that describe .
Constraints
- , where .
Output Format
Print the following three lines of output:
Array is sorted in numSwaps swaps.
where is the number of swaps that took place.First Element: firstElement
where is the first element in the sorted array.Last Element: lastElement
where is the last element in the sorted array.
Sample Input 0
3 1 2 3
Sample Output 0
Array is sorted in 0 swaps. First Element: 1 Last Element: 3
Explanation 0
The array is already sorted, so swaps take place and we print the necessary lines of output shown above.
Sample Input 1
3 3 2 1
Sample Output 1
Array is sorted in 3 swaps. First Element: 1 Last Element: 3
Explanation 1
The array is not sorted, so we perform the following swaps. Each line shows after each single element is swapped.
After swaps, the array is sorted.
Day 20: Sorting β Hacker Rank Solutionimport java.util.Scanner;
/**
* @author Techno-RJ
*
*/
public class Day20Sorting {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int a[] = new int[n];
for (int a_i = 0; a_i < n; a_i++) {
a[a_i] = in.nextInt();
}
in.close();
int count = 0;
boolean swapped = true;
for (int j = a.length - 1; (j >= 0 && swapped); j--) {
swapped = false;
for (int k = 0; k < j; k++) {
if (a[k] > a[k + 1]) {
int temp = a[k];
count++;
a[k] = a[k + 1];
a[k + 1] = temp;
swapped = true;
}
}
}
System.out.println("Array is sorted in " + count + " swaps.");
System.out.println("First Element: " + a[0]);
System.out.println("Last Element: " + a[a.length - 1]);
}
}
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