OJ Board

It is passing all the test cases give here! can someone find the error please!!!

using namespace std;
#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<vector>
#include<limits>
#include<cmath>
#define LLU long long unsigned int
#define LLD long long double
#define ...

can someone tell me why this gets a WA?
using namespace std;
#include<iostream>
#define LLU long long unsigned
LLU rev(LLU x)
{
LLU i=0;
while (x!=0)
{
i=i*10+(x%10);
x/=10;
}
return i;
}
bool ispalin(LLU x)
{
int NO[20],i=0;
while (x!=0)
{
NO[i++]=x%10;
x/=10;
}
i--;
for (int j=0;j ...

can someone give me critical cases? I tried all cases on this thread, my pro is running perfectly for all of them. But still WA