Answers for "bubble sort theory"

bubble sort code

func Sort(arr []int) []int {
	for i := 0; i < len(arr)-1; i++ {
		for j := 0; j < len(arr)-i-1; j++ {
			if arr[j] > arr[j+1] {
				temp := arr[j]
				arr[j] = arr[j+1]
				arr[j+1] = temp
			}
		}
	}
	return arr
}

bubble sort

// I Love Java
import java.io.*;
import java.util.*;
import java.util.stream.*;
import static java.util.stream.Collectors.toList;

public class Bubble_Sort_P {
    public static void main(String[] args) throws IOException {
        BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));

        List<Integer> arr = Stream.of(buffer.readLine().replaceAll("\\s+$", " ").split(" ")).map(Integer::parseInt)
                .collect(toList());

        calculate(arr);

        System.out.println(arr);
    }

    public static void calculate(List<Integer> arr) {
        for (int i = 0; i <= arr.size() - 2; i++) {
            if (arr.get(i) > arr.get(i + 1)) {
                int tem = arr.get(i);
                arr.set(i, arr.get(i + 1));
                arr.set(i + 1, tem);
                calculate(arr);
            }
        }
    }
}

bubble sort algorithm

#include <bits/stdc++.h>

using namespace std;

void bubbleSort(int arr[], int n){
    int temp,i,j;
    for(i=0;i<n;i++){
        for(j=i+1;j<n;j++){
            if(arr[i] > arr[j]){
                temp = arr[i];
                arr[i] = arr[j];
                arr[j] = temp;
            }
        }
    }
}

int main(){
    int arr[] = {1,7,33,9,444,2,6,33,69,77,22,9,3,11,5,2,77,3};
    int n = sizeof(arr) / sizeof(arr[0]);

    bubbleSort(arr, n);

    for(int i=0;i<n;i++){
        cout << arr[i] << " ";
    }

    return 0;

}

Algorithm of bubble sort

begin BubbleSort(list)

   for all elements of list
      if list[i] > list[i+1]
         swap(list[i], list[i+1])
      end if
   end for
   
   return list
   
end BubbleSort

Bubble Sort

import static java.lang.Integer.parseInt;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.StringTokenizer;

public class Day20_Sorting {

	static int MB = 1 << 20;
	static BufferedReader BR = new BufferedReader( new InputStreamReader(System.in, StandardCharsets.US_ASCII), 20 * MB);
	
	static StringTokenizer st;
	static String lastLine;
	
	static void newLine() throws IOException {
		lastLine = BR.readLine();
		st = new StringTokenizer(lastLine);
	}
	
	public static void main(String[] args) throws IOException {
		newLine();
		int N = parseInt(st.nextToken());
		
		newLine();
		int[] A = new int[N];
		for (int i = 0; i < N; i++) {
			A[i] = parseInt(st.nextToken());
		}

		int numberOfSwapps = bubbleSort(N, A);
		int firstElement = A[0];
		int lastElement = A[N-1];
		print(numberOfSwapps, firstElement, lastElement);
	}

	private static void print(int numberOfSwapps, int firstElement, int lastElement) {
		StringBuilder sb = new StringBuilder();
		
		sb.append("Array is sorted in ").append(numberOfSwapps).append(" swaps.\n");
		sb.append("First Element: ").append(firstElement).append('\n');
		sb.append("Last Element: ").append(lastElement).append('\n');
		
		System.out.print(sb);
	}

	private static int bubbleSort(int N, int[] A) {
		int cnt = 0;
		
		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 , j + 1);
		            numberOfSwaps++;
		        }
		    }
		    cnt += numberOfSwaps;
		    
		    // If no elements were swapped during a traversal, array is sorted
		    if (numberOfSwaps == 0) {
		        break;
		    }
		}
		
		return cnt;
	}

	private static void swap(int[] a, int i, int j) {
		int tmp = a[i];
		a[i] = a[j];
		a[j] = tmp;
	}

}