👉 In computational complexity theory, a problem is said to be decidable if there is an algorithm that can determine whether or not a given input string is a valid solution to the problem. This means that if you have access to an algorithmic solution for solving the problem, then you can quickly and accurately identify the answer. For example, consider the problem of determining if a given binary tree is a binary search tree (BST). A BST is defined as a tree where for every node, all its descendants
