Specification. For any real business, it takes huge effort for a group of people across many domains to consolidate what should be done. That's only the what part.
Not saying competitive programming contest easy or something, but just pointing out that in a contest with timing constraint, the requirement realization phase cannot be fitted in.
Not saying competitive programming contest easy or something, but just pointing out that in a contest with timing constraint, the requirement realization phase cannot be fitted in.
Another analogy: martial art vs. military.