Please be more descriptive about your problem. Nobody can go through a plain-code and debug.
Just try to tell what you are trying to achieve and what is going wrong… that would be helpful 
i m getting runtime error so i wanted to know if i am getting it because of memory?
You can check this submission. It should be fairly easy to understand I think. If you get stuck, do drop me your doubt.
got it.
thankyou so much dude.
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