Unnecessary tle in chef need help problem in ongoing contest

if i ignore the test cases i solved the question in O(1) but still i am getting tle?

https://www.codechef.com/BITM2021/problems/JAN20212

soln dikha apna , I got Ac in it , I did precomputation and did

https://www.codechef.com/viewsolution/42135131

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

int main() {
long t;
cin>>t;

while(t--) {
	long n;
	cin>>n;
	
	long ans = 0;;
	long x = n % 4;
	if(x == 0) ans = n;
	else if(x == 1) ans = 1;
	else if(x == 2) ans = n + 1;
	else if(x == 3) ans = 0;
	
	cout<<ans<<endl;
}

return 0;

}

its not unnecessary tle
u have missed very one imp thing

ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
write this line before taking input

when input files are large then u get TLE if u dont include this line

But i have never used this before and my solutions got accepted even for larger inputs than this

i m telling u to use it whether files large or not.
For efficiency