50分求助

#include <iostream>
#include <string>
using namespace std;
int main()
{
    string x, y;
    cin >> x;
    int a = x.size();
    if (a==1)
        cout << x;
        else if (a==2&&x[0]=='-')
            cout << x;
                int t;
                if (x[0] != '-')
                {
                    for (int i = 0; i < a; i++)
                        y[i] = x[a - i - 1];
                    for (t = 0; t < a; t++)
                        if (y[t] != 0)
                        {
                            t += 1;
                            break;
                        }
    }
    else
    {
        y[0] = '-';
        for (int i = 1; i < a;i++)
            y[i] = x[a - i];
        for (t = 1; t < a;t++)
        if (y[t]!=0)
           {
               t += 1;
               break;}
        cout << y[0];
    }
    for (int i = t; i < a;i++)
        cout << y[i];
    return 0;
}