栈我是真不会写，可是规定要用栈，所以就硬憋了一个，不知道算不算是栈，希望老师能看看

#include <bits/stdc++.h>
using namespace std;
stack<char> s;
int main()
{
    int n;
    cin >> n;
    for (int i = 1; i <= n / 2; i++)
    {
        char c;
        cin >> c;
        s.push(c);
    }
    if (n % 2)
    {
        char c;
        cin >> c;
        for (int i = 1; i <= n / 2; i++)
        {
            char c;
            cin >> c;
            if (s.top() == c)
                s.pop();
            else
            {
                cout << "No" << endl;
                return 0;
            }
        }
    }
    else
    {
        for (int i = 1; i <= n / 2; i++)
        {
            char c;
            cin >> c;
            if (s.top() == c)
                s.pop();
            else
            {
                cout << "No" << endl;
                return 0;
            }
        }
    }
    cout << ((s.empty()) ? "Yes" : "No") << endl;
    return 0;
}