Test case 5, 6 Fail

#1


Please Check.

#2

consider the case when entire LL is circular
for ex
LL is like 1,2,3 and 3 ka next is 1
entire LL is in loop
then your code fails
you have to handle the case separately when fast->next==head

#3


Updated but still failing test cases.

#4

Your mistake
if( head->next == NULL || head == NULL){
return false;
}
correct one
if( head == NULL || head->next == NULL){
return false;
}

first check head is null or not only then head->next
because if head==NULL then
head->next means NULL->next which will give run time error

Modified Code

Passing all testcases

#5

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