Floyd's Cycle Detection

#1

Why is the while loop do we have
while (fast!= NULL && fast->next != NULL) instead of
while (fast!= NULL || fast->next != NULL)?

#2

Just take a case and check for that. Both conditions must be satistfied in order to move further.
Say fast reaches to the last node:
while (fast!= NULL || fast->next != NULL) will give an error. because NULL->next is invalid.

#3

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