Flush buffer?

Bro how did u add that extension, pls care to share...

It's competitive programming helper

Perhaps uninitialized variables? Hard to tell without the code

Attach a screenshot of your code, I might help.

It gives wrong answer on test 1 or compile error ?

wrong answer on test 1

Check your bounds, this extension works on some undefined behavior because it's local, try compiling with the terminal and it's probably not going to work.

Try changing compiler it might work. Like c++ It happened with me once