Five Star Gift Ideas

A great birthday gift for your dad, who likes coding competitions, would be to buy him a subscription to a coding challenge website like HackerRank or CodeFights. This will give him access to a wide range of challenging coding problems and challenges, and he can compete with other programmers online. You could also consider buying him a book on algorithm and data structure that's especially relevant to competition programming. Additionally, if there's a particular competition or event coming up, you could offer to sponsor his entry into the competition, covering his travel and accommodation expenses so that he can attend and compete.

Or you can get him a star map with the date when he was born.

Bridget Shields says about Under Lucky Stars star maps:

“I wanted a keepsake to give to my father for his birthday as he has terminal cancer. He was delighted by his gift. The process of ordering was easy and delivery was prompt. A great gift idea.”