As most of these answers don’t actually get at the substance of the question, merely the intention, perhaps this will help: As far as I can tell the only difference between a Linked List and a Circular Linked List is the behavior of iterators upon reaching the end or beginning of a list. A very … Read more
You can also take a look at llist python package, which provides some useful features that deque does not. There are not only doubly linked lists, but also single linked lists data structure in that package. IMHO, one of the biggest advantages of this package is the ability to store a reference to the llist … Read more
There are many tradeoffs involved here and I don’t think that there’s a “correct” answer to this question. If you implement the stack using a linked list with a tail pointer, then the worst-case runtime to push, pop, or peek is O(1). However, each element will have some extra overhead associated with it (namely, the … Read more
The short answer to this is that, Python is a pass-by-object-reference language, not pass-by-reference as implied in the question. It means that: result and result_tail are two variables that happen to point at the same value Mutation / Changing of the underlying value (result_tail.next = ListNode(1)) will affect the value shown by result However, assigning … Read more
The ElementAt extension method will do it: // This is 0-based of course var value = linkedList.ElementAt(n); Don’t forget this is an O(n) operation because LinkedList<T> doesn’t provide any more efficient way of accessing an item by index. If you need to do this regularly, it suggests that you shouldn’t be using a linked list … Read more
On strings and memory allocation: A string in C is just a sequence of chars, so you can use char * or a char array wherever you want to use a string data type: typedef struct { int number; char *name; char *address; char *birthdate; char gender; } patient; Then you need to allocate memory … Read more
Vector is another name for dynamic arrays. It is the name used for the dynamic array data structure in C++. If you have experience in Java you may know them with the name ArrayList. (Java also has an old collection class called Vector that is not used nowadays because of problems in how it was … Read more
It adds some type checking. With your version, this compiles fine (without warning): struct foo { int bar; }; …. float a; struct foo *var = container_of(&a, foo, bar); With the kernel version, the compiler reports: warning: initialization from incompatible pointer type Good explanation of how the macro works: container_of by Greg Kroah-Hartman.
If you relax the constraint that the Position column must contain integers from 1 to N and instead allow it to contain any numbers then you can do both searches and updates efficiently. You can insert an item between two other items with position A and B by calculating the average (A + B) DIV … Read more
Have two pointers iterating through the list; make one iterate through at twice the speed of the other, and compare their positions at each step. Off the top of my head, something like: node* tortoise(begin), * hare(begin); while(hare = hare->next) { if(hare == tortoise) { throw std::logic_error(“There’s a cycle”); } hare = hare->next; if(hare == … Read more