The fact that you get confused and cannot understand the generalization does not mean you can tell others to go fuck themselves. It's not how things work here. You could just read the "HINT I" in the description, which explains exactly this aspect.

Would you just GIT GUD instead of insulting people, would be much more beneficial to everyone.

where positive numbers come from in a negative number series, is there some kind of mathematical proof that there should be positive numbers???

Yes, the HINT I explains this.

No, it's not broken.

Print the input, without it, no one can know what's right or wrong there.

That's JUnit way of highlight where two strings are different, those brackets aren't part of the string. The expected order is 2 and 200, your code returns 200 and 2.

No. Look at the top of the page: 12569 people passed in Java.