Citadel | Software Engineer | Coding | Online Assessment

1. Return the number of unique palindromic substrings of a given string. 2. Create a class that simulates auth tokens with a TTL. Same problem and requirements and solution as https://leetcode.com/problems/design authentication manager/, just worded a little differently. 3. Print all nodes at the end of all diameters in a tree. NOTE: This is not necessarily a binary tree it is an acyclic, undirected graph.