Ask HN: Best interview language: Java, Python, C++?

Like many, I want to get better at technical interviews to move my career forward. At this point, it seems to me I need to get good at one of the 'typical' languages: Java, Python, and C++. If I'm honest, I'm only barely proficient in these (my background is niche).

If I want to optimize my time and energy, which programming language do you recommend spending time mastering for the purpose of technical interviews?