May 10, 2016 · If you don't want to use double pointer, you can use the header node as a sentinel node, which act solely as a placeholder, so that the first element is linked by head->next, and to check if the list is empty, check head->next == NULL. Try this:

May 18, 2020 · If we hold a pointer to the front and to the back, and we make the front the first element in the list, and the back the last element in the list, we can successfully make a queue with O(1) behavior for both enqueue and dequeue. Here is the code, then we'll walk through some examples: intQueue. h

We can traverse the list by starting at the first node (the front) and repeatedly following its link. Each element is stored separately from the rest. The elements are then chained together into a sequence.

Linked lists are a common alternative to arrays in the implementation of data structures. Each item in a linked list contains a data element of some type and a pointer to the next item in the list. It is easy to insert and delete.

–Describe how the implementation of a tail pointer in a linked list –Update the constructor, and push front and pop front member functions to account for this new member variable

Feb 9, 2020 · You are passing the pointer head by value in the function append. So the function deals with a copy of the passed to it pointer. Changing the copy does not influence on the original pointer. Either pass it by reference or return updated head from the function.

Jul 9, 2014 · If the list isn't double linked, you'll have to start at the first element to find the last one: void LinkedList::pop_back() { mBack->data = NULL; current = mFront; do{ current = current->next } while ( current->next ); mBack = current; }

Write a function that takes in a pointer to the front of a linked list of integers and returns whether or not the list that's pointed to is in sorted (nondecreasing) order. An empty list is considered to be sorted.

Adding to the front of our bare-bones linked lists is very natural. Adding to the back takes more work! You have two basic cases, which really need to be handled separately: In this case you must create a new node and change the actual pointer L to point to that new node. In this case the pointer L will remain unchanged.

In contrast, a linked list allocates space for each element separately in its own block of memory called a "linked list element" or "node". The list gets is overall structure by using pointers to connect all its nodes together like the links in a chain. Each node contains two fields: a "data" field to store whatever element type the list holds