This technical problem deals with determining whether or not a given string consisting of only brackets is valid. A string is considered valid if the open brackets are closed by the same type of brackets in the correct order. An empty string is also considered valid.

A.I. Evaluation of the Solution

The candidate's solution is correct and uses a stack to keep track of the order of the brackets. The solution is also complete, with tests for all the different cases.

Evaluated at: 2022-12-03 08:15:33