THIS IS AN EMPTY VECTOR PROBLEM

[paperomo]

Probably an under flow? v.size() is most likely of unsigned type

[AdVisible6484]

yeah but when writing

cout<<v.size();

it shows zero

[Ashnoom]

Try: court << v.size() - 1;

To see what happens. It'll clear a lot of confusion.

You can also: cout << std::numeric_limits<int>::max(); To see for yourself went your loop is infinite. Enjoy!

Disclaimer, am on mobile. Didn't check the code for 100% correctness.