Bubble Sort

C++

//Bubble Sort⏩ Repetedly swap two "adjacent" elements if they are in wrong order.

#include <iostream>
#include <vector>
#include <algorithm>
// #include <numeric>

using namespace std;

int main()
{

    freopen("inputf.in", "r", stdin);
    freopen("outputf.in", "w", stdout);

    int n;
    cin >> n;

    vector<int> v(n);

    //Assigning values to the vector
    for (int i = 0; i < v.size(); i++) {
        cin >> v.at(i);
    }


    //Bubble Sort Algorithm
    int count = 1;
    while (count < n) {
        for (int i = 0; i < n - count; i++) {
            if (v.at(i) > v.at(i + 1)) {
                swap(v.at(i), v.at(i + 1)); //#include <algorithm>
                //OR    swap(v[i], v[i+1]);
                //OR    int temp = v.at(i);
                //      v.at(i)=v.at(j);
                //      v.at(j)=temp;
            }
        }
        count++;
    }


    //another way of Bubble Sort
    for (int i = 0; i < n - 1; i++) {
        for (int j = 0; j < n - i - 1; j++) {
            if (v.at(j) > v.at(j + 1)) {
                swap(v.at(j), v.at(j+1));
            }
        }
    }

    //printing the Vector
    for (auto el : v)
        cout << el << " ";


    //<==<==<==<==<==<==STL std::sort()⏩⏩⏩⏩⏩⏩
    //also refer ⏩ http://www.cplusplus.com/reference/algorithm/sort/
    //also refer ⏩ https://www.geeksforgeeks.org/sort-c-stl/

    // sort(v.begin(), v.begin() + v.size());

    // for (auto el : v)
        // cout << el << " ";

    return 0;

}

Java

import java.util.*;
import java.io.*;

public class BubbleSort {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];

        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        // Bubble Sort
        int count = 1;
        while (count < n) {
            for (int i = 0; i < n - count; i++) {
                if (arr[i] > arr[i + 1]) {
                    int temp = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = temp;
                }
            }
            count++;
        }

        for (var el : arr) {
            System.out.print(el + " ");
        }

        sc.close();
    }

}

Python

def hello_world():
  print 'Hello, world!'