快排(双指针):
void quick_sort(int q[],int l,int r)
{
if(l>=r)return ;
int i=l-1,j=r+1,x=q[(l+r)>>1];
while(i<j)
{
do i++;while(q[i]<x);
do j--;while(q[j]>x);
if(i<j)swap(q[i],q[j]);
}
quick_sort(q,l,j),quick_sort(q,j+1,r);
}
归并排序
void merge_sort(int q[N], int l, int r)
{
if (l >= r)return;
int mid = (l + r )>> 1;
merge_sort(q, l, mid),merge_sort(q, mid+1, r);//一分为二
int k = 0 ,i=l,j=mid+1;//指针处理
while (i <= mid && j <= r)
{
if (q[i] < q[j]) temp[k++] = q[i++];
else temp[k++] = q[j++];
}
while (i <= mid)temp[k++] = q[i++];
while (j <= r)temp[k++] = q[j++];
for (int j = 0,i=l; i <= r; i++,j++) q[i] = temp[j];//合二为一操作
}
原文:https://www.cnblogs.com/WAsbry/p/13159988.html