How can I find a type of a variable in C++?

Oh man!! Just Getting stuck in the verdict 'ok' and the judge isn't accepting my code. Help me to get out from this.

I am facing a problem named Checker Log. My output is right. But don't know what does this mean. plz explain.

Many of us don't know how to add someone or send request in this judge . I also didn't know that. So you just have to click the star sign alongside the name and thus you can add someone.. Thank You!