[adavidoaiei]

They are two types of business, first type business to business, software made to run internal in a company, the business run on this software, generally in this kind of software you use enterprise frameworks, the second type are business to consumer where anyone can made an account and use application, some software as a service are like that, they are too other types of web applications business to consumer.

When you allow that anyone to make an account and use your application sometimes you couldn't rely on enterprise technology and it's better to write everything from scratch or to customize open source solutions.

What they are testing in algorithms contests: 1.) the algorithm is correct with various test sets 2.) the performance of the algorithm, running time in milliseconds, there you should to know how to measure time complexity of algorithm with O(N) 3.) memory consumed, there you should know how much memory you are allocating for variables, for example a variable of type byte consume 8 bits

I think that programmers which has prizes in algorithms contests are suitable for business to consumer applications because there they will find a challenge, this kind of programmers will be bored to dig in enterprise frameworks.