1

#include <bits/stdc++.h>
using namespace std;
int n;
int a[105];
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    for (int i = n; i >= 1; i--)
        cout << a[i] << " ";
    return 0;
}

2

#include <bits/stdc++.h>
using namespace std;
int n;
int a[105];
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    // 对应元素下标之和为 n+1
    for (int i = 1; i <= n / 2; i++)
        swap(a[i], a[n + 1 - i]);

    for (int i = 1; i <= n; i++)
        cout << a[i] << " ";
    return 0;
}

3

#include <bits/stdc++.h>
using namespace std;
int n;
int a[105];
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    int i = 1, j = n;
    while (i < j)
    {
        swap(a[i], a[j]);
        i++;
        j--;
    }
    // for (int i = 1, j = n; i < j; i++, j--)
    //     swap(a[i], a[j]);

    for (int i = 1; i <= n; i++)
        cout << a[i] << " ";
    return 0;
}

4

#include <bits/stdc++.h>
using namespace std;
int n;
int a[105];
int b[105];
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    for (int i = 1; i <= n; i++)
        b[i] = a[n + 1 - i];
    for (int i = 1; i <= n; i++)
        a[i] = b[i];

    for (int i = 1; i <= n; i++)
        cout << a[i] << " ";
    return 0;
}