45762893920 is bigger than Integer.MAX_VALUE and java can't use it as an int. You have to tell java to treat it as a long by adding an L
45762893920L will work.

In the first comment there is a hidden Right-To-Left override character. So all following text will be interpreted as right to left. Try to select the text in the solution and you will see how selection behaves differently from normal. So for the computer it looks like this:

/* (display next text as right to left) */ def greet = "hello world!"

Why then the compiler does not complain? Because it is in the comment section.

imagine using sort when you can just do a linear scan

how does this work?

oh damn. I don't know why I thought we were supposed to reverse the digits. my bad.

Please take note that approaching 50K coders have solved this kata in Python, so there must be something amiss about your foreign environment. I suggest you print your I/O and debug based on what's happening exclusively here on Codewars.

uint64_t is appropriate, but SIGSEGV smells like an allocation error... you may post your code with proper markdown and remember to use a spoiler tag, otherwise it's just a guess as to why your code fails

Issue with your code, that's the desired output

two test cases are incorrect in Java checker.

test_04:
input is 1021 but it expects 2110 as output. probably a typo in the output.

test_05:
input is 123495678 but it expects 987654321 as output. probably a typo in the input.

O! thank you so much!!!!!!

The line vect[i] = m % 10; is wrong. The vector is empty, and you cannot access i-th element of an empty vector.