Aizu - ALDS1_2_A Bubble Sort 冒泡排序

Write a program of the Bubble Sort algorithm which sorts a sequence A in ascending order. The algorithm should be based on the following pseudocode:

BubbleSort(A)
1 for i = 0 to A.length-1
2     for j = A.length-1 downto i+1
3         if A[j] < A[j-1]
4             swap A[j] and A[j-1]

Note that, indices for array elements are based on 0-origin.

Your program should also print the number of swap operations defined in line 4 of the pseudocode.

Input

The first line of the input includes an integer N, the number of elements in the sequence.

In the second line, N elements of the sequence are given separated by spaces characters.

Output

The output consists of 2 lines.

In the first line, please print the sorted sequence. Two contiguous elements of the sequence should be separated by a space character.

In the second line, please print the number of swap operations.

Constraints

1 ≤ N ≤ 100

Sample Input 1

5
5 3 2 4 1

Sample Output 1

1 2 3 4 5
8

 

Sample Input 2

6
5 2 4 6 1 3

Sample Output 2

1 2 3 4 5 6
9

代码如下：

#include <cstdio>
#include <cstring>
#include <algorithm>
#include <iostream>
using namespace std;
const int maxn=105;
int n;
int a[maxn];
void BubbleSort ()
{
    int sum=0;
    for (int i=0;i<n;i++)
        for (int j=0;j<n-i-1;j++)
            if(a[j]>a[j+1])
           {
                int temp=a[j];
                a[j]=a[j+1];
                a[j+1]=temp;
                sum++;
           }
    for (int i=0;i<n;i++)
        printf("%d%c",a[i],i==n-1? '\n':' ');
    printf("%d\n",sum);
}
int main()
{
    scanf("%d",&n);
    for (int i=0;i<n;i++)
        scanf("%d",&a[i]);
    BubbleSort();
    return 0;
}