A priority queue is a data structure where each element is served according to its priority rather than just the order it arrived. A multiple priority queue implements this with several separate queues — one per priority level — so that higher-priority items are always removed before lower-priority ones. This C program builds a simple …
A binary search tree (BST) in C is a binary tree where every node satisfies one invariant: all values in the left subtree are less than the node, and all values in the right subtree are greater. This ordering means search, insert, and delete all run in O(h) time — where h is the tree …
A doubly linked list in C extends the singly linked list by giving each node two pointers: one to the next node (next) and one to the previous node (prev). This bidirectional linkage lets you traverse the list in either direction and delete a node in O(1) given only a pointer to that node — …
A queue implemented with a linked list in C has no fixed size limit — it grows and shrinks dynamically using malloc and free. Each node holds a value and a pointer to the next node. Two pointers, front and rear, track the dequeue end and enqueue end respectively. Linked List Queue vs Array Queue …
A circular queue in C solves the main limitation of a linear queue: wasted array slots after dequeuing. In a linear queue, rear keeps advancing rightward; once it hits the end of the array, the queue reports “full” even if dequeued slots at the front are free. A circular queue wraps rear back to index …
A queue program in C implements the FIFO (First In, First Out) data structure — elements are inserted at the rear and removed from the front, just like a real queue. The two core operations are ENQUEUE (insert) and DEQUEUE (remove). This page covers the array-based linear queue with all operations, a step-by-step trace, and …