简单易懂

#include<iostream>
using namespace std;

const int N = 1000;
int a[N], b[N];

void reverse(int a[], int size)
{
    for (int i = size - 1; i >= 0; i--)
        b[size - 1 - i] = a[i]; //把要反转的size个数逆序保存到b数组中

    for (int i = 0; i < size; i++)
        a[i] = b[i]; //再把b数组中保存的size个数顺序赋a数组即可
}

int main()
{
    int n, size;
    cin >> n >> size;
    for (int i = 0; i < n; i++) cin >> a[i];

    reverse(a, size);

    for (int i = 0; i < n; i++) cout << a[i] << " ";

    return 0;
}