Day20.java

import java.io.*;
import java.util.*;
import java.util.stream.*;
import static java.util.stream.Collectors.toList;


public class Day20 {
    static void swap(List<Integer> a, int x,int y){
            int temp = a.get(x);
            a.set(x, a.get(y));
            a.set(y, temp);            
        }

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

        int n = Integer.parseInt(bufferedReader.readLine().trim());

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

        // Write your code here
        int numberOfSwaps = 0;
        for (int i = 0; i < n; i++) {
            // Track number of elements swapped during a single array traversal
            
            for (int j = 0; j < n - 1; j++) {
                // Swap adjacent elements if they are in decreasing order
                if (a.get(j) > a.get(j+1)) {
                    swap(a, j, j+1);
                    numberOfSwaps++;
                }
            }
            
            // If no elements were swapped during a traversal, array is sorted
            if (numberOfSwaps == 0) {
                break;
            }
        }
        System.out.printf("Array is sorted in %d swaps.\n",numberOfSwaps);
        System.out.printf("First Element: %d\n",a.get(0));
        System.out.printf("Last Element: %d\n",a.get(a.size()-1));
        
        bufferedReader.close();
    }
}