Solution to the Programmers 'Disguise' hash problem using combinatorics to count clothing outfit combinations.

Solution for the Programmers phone book problem using sorting and prefix comparison.

Overview of phrase retrieval for open-domain QA, using dense-sparse representations to bypass the retriever-reader pipeline.

Solution for the Programmers immigration problem using binary search on time cost.

An approach that enables large-batch contrastive learning under memory constraints by using in-batch negatives instead of explicit negative sampling.

Types of training bias in MRC and ODQA, and techniques to mitigate them including negative sampling and annotation bias handling.