Dùng dictionary(map) để cải tiến thuật toán.
Link topic: https://daynhauhoc.com/t/interview-04-giai-bai-01-two-sum/81715
Topic tổng hợp: https://daynhauhoc.com/t/topic-tong-hop-cac-video-chia-se-ve-interview-cua-ltd/81603?u=ltd
Link playlist: https://www.youtube.com/watch?v=-xql5Y35-SM&list=PLyiioioEJSxGl_AEyiKSAeoeH_0-GvV4b
