归并排序和快速排序的算法实现

//将有二个有序数列a[first...mid]和a[mid...last]合并。
void mergearray(int a[], int first, int mid, int last, int temp[])
{
int i = first, j = mid + 1;
int m = mid,   n = last;
int k = 0;

while (i <= m && j <= n)
{
if (a[i] <= a[j])
temp[k++] = a[i++];
else
temp[k++] = a[j++];
}

while (i <= m)
temp[k++] = a[i++];

while (j <= n)
temp[k++] = a[j++];

for (i = 0; i < k; i++)
a[first + i] = temp[i];
}
void mergesort(int a[], int first, int last, int temp[])
{
if (first < last)
{
int mid = (first + last) / 2;
mergesort(a, first, mid, temp);    //左边有序
mergesort(a, mid + 1, last, temp); //右边有序
mergearray(a, first, mid, last, temp); //再将二个有序数列合并
}
}

bool MergeSort(int a[], int n)
{
int *p = new int
;
if (p == NULL)
return false;
mergesort(a, 0, n - 1, p);
delete[] p;
return true;
}

#include<iostream>
using namespace std;
void quickSort(int a[],int,int);
int main()
{
int array[]={34,65,12,43,67,5,78,10,3,70},k;
int len=sizeof(array)/sizeof(int);
cout<<"The orginal arrayare:"<<endl;
for(k=0;k<len;k++)
cout<<array[k]<<",";
cout<<endl;
quickSort(array,0,len-1);
cout<<"The sorted arrayare:"<<endl;
for(k=0;k<len;k++)
cout<<array[k]<<",";
cout<<endl;
system("pause");
return 0;
}

void quickSort(int s[], int l, int r)
{
if (l< r)
{
int i = l, j = r, x = s[l];
while (i < j)
{
while(i < j && s[j]>= x) // 从右向左找第一个小于x的数
j--;
if(i < j)
s[i++] = s[j];
while(i < j && s[i]< x) // 从左向右找第一个大于等于x的数
i++;
if(i < j)
s[j--] = s[i];
}
s[i] = x;
quickSort(s, l, i - 1); // 递归调用
quickSort(s, i + 1, r);
}
}