倒置函数reverse

#include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int a[] = {1,2,3,4};
int main()
{
reverse(a,a + 4);
for(int i = 0; i < 4; i++)
printf("%d ",a[i]);
printf("\n");
return 0;
}