Sort排序

#include<algorithm>
struct shu
{
  int num;
};

bool cmp(shu a, shu b)
{
	return a.num>b.num;
   //由小到大排 则 return a.num<b.num;
}
int a[10];
sort(a, a + 10,cmp);     

头文件.   #include<aglorithm>