Next Palindrom wrong answer

What am I doing wrong, I can’t figure it out.

#include <iostream>
    using namespace std;

    bool palCheck(int a)
    {
        int x=a,aux=0;
        while(a)
        {
            aux=aux*10+a%10;
            a=a/10;
        }
        if(aux==x)
            return true;
        else
            return false;
    }

    int nextPal(int a)
    {
        while(palCheck(a)!=true)
            a++;
        return a;
    }

    int main()
    {
        int n, x, i=1, f;
        cin>>n;
        f=n;
        int v[n+1];
        while(f)
        {
            cin>>x;
            x++;
            v[i]=nextPal(x);
            i++;
            f--;
        }
        for(i=1;i<=n;i++)
            cout<<v[i]<<'\n';
        return 0;
    }