#include<iostream>
#include<cmath>
#define ll unsigned long long
using namespace std;
int ispalindrome(ll int a)
{
ll int temp=a;
int n=0;
while(temp){temp/=10;n++;}
int arr[n];
for(int i=0;i<n;i++)
{
arr[n-i-1]=a%10;
a/=10;
}
int flag=0;
for(int i=0;i<n/2;i++)
{
if(arr[n-i-1]!=arr[i])
{
flag++;break;
}
}
if(flag==0){return 1;}
else{return 0;}
}
int main()
{
int test;cin>>test;
while(test--)
{
ll int n;cin>>n;
ll int i=1;
while(1)
{
if(ispalindrome(n+i)==1){cout<<n+i<<endl;break;}
i++;
}
}
}
I have tried a lot of test cases. Where have I gone wrong?