1) Questions about abstract and virtual functions (difficulty: easy) 2) Questions on computing the time complexity of an algorithm (difficulty: easy) 3) An algorithm was described and a data structure had to be chosen for the task (difficulty: easy) 4) Select the 3rd largest date from a list of dates (difficulty: medium) 5) You are given a string which describes a binary search tree, for example: (A, B) (B, C) (C, D) ... where each tuple denotes a (parent, child). You need to parse the tree and report various error cases like cycle, multiple roots, multiple children, etc. If the tree is valid, you need to print the S-expression of the tree (difficulty: hard)

Was a Hacker Rank average but difficult, then a CS questions in multiple choice and finally some kind of minigames.