Looking into it.
Well, what if we ban this account?? :3 
On a serious note- if you cant get the username, and strictly dont login or do any activity from it, @admin may decide to be lenient with your case.
Please share the exact question and more necessary details.
Seems a basic math question. Just do repeated subtraction till you get a number smaller than quotient. For reference: Division as repeated subtraction - a complete lesson for third grade
Please read about subsequences in general. Treat them equivalent to subsets and the explanation will be crisp and clear.
Practice hackerrank easy section completely. Problems related to array, 2-D array, and strings are bountiful there. Google whatever seems new or tough. Lots of dedication is required for coding.
An announcement regarding this has been made.
I think you might want to learn about File reading and file writing in your programming language (Reading input from a file and writing output to another file)
Access denied to the link. Is it from an on going contest?
You need karma to comment, upvote or ask questions.
You are storing only 1 team’s name. What if the other teams name gets overwritten in the next input?
Imagine you keeping/stacking things one over the other. Condition is, you must take things out without making the entire pile fall. Where will you add new element? -At top of pile. Where will you remove an element from? Only top of pile. Is it possible to remove any element not at top? No, an element can be removed only if its at top.
This is the concept of stack. You can google for JAVA stacks for further methods.
This topic often takes time. Hence, lots of patience is required. The best bet is to check out some of easier HLD problems, and try to apply the concept there. New topics can take as long as 1-2 weeks to settle in. So dont worry 
I think I know where you are going wrong. But no discussion is allowed till contest is live. You can ask for help tomorrow, after 3PM.
No worries, I found my mistake :). Thanks for the comment.
I dont think so! The question is present in easy section of practice and name is Andrew and the meatballs.Also the question dates back to 2013! and it has a editorial too… anyhow this is the code over ideone.
How can i gain karma? I can neither ask question or reply to a question!
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You gain karma when other people upvote you, which is done when you do something good for the community.
Briefly speaking,you are given an expected rank in each contest based on your previous performances,if you do better,you gain points and vice versa.
Its just like regular contest- its your daily preparation which will help you actually. Just chill and do your best.
Sorting? Why did you sort,can you explain a bit more? The operations allowed were quite restricting, you can only swap elements at a[i] and a[n-i+1] (1 based indexing)- so where did sorting come from?