It would be greatly appreciated if someone could write up a mini-editorial, just expounding on the idea is enough and bonus points if you could link your submission for the problem as well. The folks at Codechef seem to take the editorial business not so seriously and have been late once again.

Thanks.

The Problems are here

P.S. If you're really short on time, you could skip explaining the first three problems (since they're easy) and explain the rest.