插入排序 Java排序算法之插入法排序 直接插入排序 折半插入排序

[java]代码库

//直接插入排序
void DirectInsertionSort(int* arr, int nLen)
{
int i, j;
for (i=1; i<nLen; i++)
{
int temp = arr[i];
for (j=i-1; j>=0; j--)
{
if (temp < arr[j])
arr[j+1] = arr[j];
else
break;
}
if (j+1 != i)
arr[j+1] = temp; //注意这里是j+1
}
}
//折半插入排序
void BinaryInsertionSort(int* arr, int nLen)
{
int i, j;
int low, mid, high;
for (i=1; i<nLen; i++)
{
int temp = arr[i];
if (temp < arr[i-1])//这个判断可不要
{
low = 0;
high = i-1;
while (low <= high) //error: while( low < high) 注意这里还需要 等号
{
mid = (low+high)/2;
if (temp < arr[mid]) 
high = mid - 1;
else 
low = mid + 1;
}
//经过上面的折半查找插入位置后，这时插入位置为low或者high+1,这时low等于high+1
//for (j=i-1; j>=high+1; j--)
//{
// arr[j+1] = arr[j];
//}
//arr[high+1] = temp;
for (j=i-1; j>=low; j--) 
{
arr[j+1] = arr[j];
}
arr[low] = temp; 
}
}
}