【转】冒泡排序

 

public static void BubbleSort(int[] array)
{
    for (int i = 1; i < array.Length; i++)
    {
        for (int j = array.Length-1; j >= i; j--)
        {
            if (array[j]<array[j-1])
            {
                int temp = array[j];
                array[j] = array[j - 1];
                array[j - 1] = temp;
            }
        }
    }
}

static void Main(string[] args)
{
    int[] array = { 49, 38, 65, 97, 76, 13, 27, 0, 34 };
    BubbleSort(array);
    foreach (int item in array)
    {
        Console.Write(item+",");
    }
}

 

性能优化版

 

public static void BubbleSort(int[] array)
{
    bool flag = true;
    for (int i = 1; i < array.Length && flag; i++)
    {
        flag = false;//初始化为false,默认为有序了。但是如果下面的代码执行了,就会置为true
        for (int j = array.Length-1; j >= i; j--)
        {
            if (array[j]<array[j-1])
            {
                int temp = array[j];
                array[j] = array[j - 1];
                array[j - 1] = temp;
                flag = true;//有交换,则设为true
            }
        }
    }
}

static void Main(string[] args)
{
    int[] array = { 49, 38, 65, 97, 76, 13, 27, 0, 34 };
    BubbleSort(array);
    foreach (int item in array)
    {
        Console.Write(item+",");
    }
}

 

 

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