https://www.codechef.com/problems/PALIN

https://www.codechef.com/problems/PALIN

this is my code.actually i found after my solution that it can take 10^6 digits.For this i don’t know how to proceed.plz some1 solve this for me by modifying my code so that i can grab what’s going wrong with me.plz.

#include<bits/stdc++.h>
using namespace std;

string mid(string &x,int y)
{
int a=y/2;
if(y%2!=0)
while(a>0)
{
if(x[a]==9)
{
x[a]=0;

    }

    else
        {
            x[a]+=1;
            return(x);
        }

        a--;

}

else
    while(a>0)
{
    if(x[a]==9)
    {
        if(x[a]>x[a-1])
        {
            x[a]=0;
            x[a-1]=0;

        }

        else if(x[a]==x[a-1])
        {
            x[a]=0;
            x[a-1]=0;
        }

        else
        {
            x[a]=x[a-1];
        }
    }

    else
        {
            if(x[a]>x[a-1])
        {

            x[a-1]+=1;

        }

        else if(x[a]==x[a-1])
        {

            x[a-1]+=1;
        }

        else
        {
            x[a]=x[a-1];
        }
            return(x);
        }

        a--;

}

}

void change(string &x,int y)
{
int a=y/2-1;

while(a>=0)
{

    x[y-1-a]=x[a];
    a--;


}
    cout<<x<<endl;

}
int main()
{
int t;
cin>>t;
while(t–)
{
long long int n;
cin>>n;
n=n+1;

    ostringstream str1;

    str1<<n;

    string s;
    s=str1.str();

    int len;
    len=s.length();
    int flag=0;

    if(n<=11)
        cout<<"11"<<endl;
    else

    {
        for(int i=len/2-1;i>=0;i--)
    {
        if(s[i]<s[len-1-i])
        {
            flag=1;
            break;
        }
        else if(s[i]>s[len-1-i])
        {
            flag=2;
        }

    }

    if(flag==0)
    {
        cout<<s<<endl;

    }

    else if(flag==2)
    {
        change(s,len);


    }

    else if(flag==1)
    {

        s=mid(s,len);
        change(s,len);

    }

    }

}

return 0;

}