Ragib_Zaman

Answering a technical question takes more time and effort than making general comments.

Ok sure. This explains a lot. If that's the problem you're getting, then it is indeed testing basic programming skills. But the general landscape has gone far beyond this. Nowadays this solution would probably not get you the job. Instead of sorting, you should create hashmaps storing counts of each character and checking equality of the hashmaps. And if you didn't produce the hashmaps solution within 10 minutes, you would not be competitive with the hoardes of people drilling these problems and thus producing the hashmaps solution within 5 minutes. What most people here are complaining about are being expected to solve significantly harder problems within tight timeframes. If you are interested in what these ridiculous problems can be, go to Leetcode and browse the "Hard" problems.

I'm assuming you have never needed to practice these problems as you already have basic programming skills and are thus able to do every Leetcode Hard within 30 minutes of first seeing the problem?

In those subjects they choose different units so that the speed of light is 1 of that unit, but it still has that unit associated to it. So it is not dimensionless.

The speed of light has units. The fine structure constant is a dimensionless quantity, like pi.

The thirst mechanism becomes less reliable with age, so older people may find those products beneficial. But yes, for most healthy young to middle aged people, "drink when you're thirsty" is generally fine. Maybe with the added subpoint that if your urine is often colored, try to drink a little more.

I think it's specific to web development, in particular it tests for performance under user load.

It's generally pretty rare for a market maker to lose money over a whole year. Colour me surprised.

Facebook's tendency to display content which reflect more extreme versions of the opinions that the user already has is probably a sizeable force behind our societies growing division. They know this, but they also know that type of content stops people from clicking off their site and drives up engagement, giving them more opportunities to advertise to you. They are a net negative to society.

There's a spectrum of roles. The role you describe is that of a trader at the extreme end (little coding ability required, manual monitoring of strategies/opportunities). But there are many traders who spend a majority of their time doing data analysis and programming while monitoring mostly automated strategies out of the corner of their eye. There are researchers who focus purely on statistics and ML projects. Some even get to spend a good portion of their time reading papers, expanding their knowledge and doing basic research, not just applying their existing knowledge to financial datasets. There are also Devs. Some work on ultra low latency systems (though this is not Jane Streets expertise). Some work on Jane Street's OCaml compiler.

Apart from the OCaml compiler, everything else is fairly typical of the spectrum of roles you can find at the very large high frequency firms. And mid-sized firms are similar yet again, minus the basic research. I would say it is definitely worth working in this industry if anything above sounds interesting to you.

Most fruit are nowhere near as healthy as most people expect they are. They have been selectively bred over many hundreds of years to be far larger, sweeter and more devoid of micronutrients than they were hundreds of years ago. The amount of sugar (especially fructose) in fruits like apples, oranges and bananas is shockingly high, and can cause or exacerbate conditions such as obesity, fatty liver, type 2 diabetes, gout and other metabolic or inflammatory diseases.

Replacing some fruit with vegetables instead, and choosing less sweet fruit like various berries or melons may be a good idea for most people.

Too much Vitamin D without sufficient Vitamin K can lead to high levels of serum calcium that are not absorbed into the bones. One function of Vitamin K is to shuttle calcium into the bones. You can often purchase combined Vitamin D and Vitamin K supplements to avoid those issues.