Hello everyone, I started using codeforces from a week ago and I have got myself into this problem that everytime I submit a solution it shows correct Execution time but always shows "0KB" Memory usage whereas my friend has the submitted exact same program and his code shows "4KB" memory usage. I am not sure what is causing this

I am using C++ language and tried submitting through 'GNU C++ 17' & 'GNU C++ 14'. I have only 5 problems so I wouldn't mind deleting my account. Please help me if you can :) Thanks in advance.

I've attached the link of my submissions. https://codeforces.com/submissions/abhijadhav8308