Sir, do you think i have any scope in impressing girls with a good codeforces rating. I am asking you this since due to your exceptional rating i suppose you would have had your fair share of experiences ;)

You can submit any number of times without any penalty.

Ummm. This and last year TCS (Tata Consultancy Service) has been used as plaform onsite. On this grader there are some pretests on the judge basically it acts as a grader very similar to Codechef or any other judge. But note that these might NOT be the final test data against which your solution is checked. Also due to memory limits of the PCs at the centre these test data were not very exhaustive or big. Atleast this was the case last year though there might be some changes this year.

Follow up on Rajat's hint -

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Hi, I am Sidhant. I am currently in 12th grade. I am preparing to crack IOI this year and have been attending the training camp since last 2 years. Glad to meet you all.