Thank you for helping me. But can you explain me why I cannot use global variable? It does seem to work perfectly fine when I run it in my local computer.

When I tried to attempt the test, it throws a exception what() in stoi (I am using c++). I also tried using stringstream also, but no luck. It works perfectly fine when I test my code. Can someone help me?

If I run the testcase individually, I pass the testcase. But when I run it collectively, it is failing.