for less than n=130 case we could do
for(ll i=0;i<n-4;i++)
{
if((arr[i]^arr[i+1]^arr[i+2]^arr[i+3])==0)
flag=1;
}
???
if not give me a test case where it got failed
Why we need to make 4 nested loops
Hi
it not compulsory to take number continuously. numbers taken can be random index, in single FOR loop you are considering only continues numbers.
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