> Then you didn't have an easy problem to begin with, you had a hard one ("summing too many numbers fast enough") [1]. That’s exactly what the initial comment

> Then you didn't have an easy problem to begin with, you had a hard one ("summing too many numbers fast enough") [1]. That’s exactly what the initial comment said: > The "solve X as quickly as possible" is now the problem. Not just solve X. I And that sounds like a hard (therefore interesting) problem! There were two separate points: 1) Finding a simple solution to a problem can be hard 2) Solving an ‘easy’ problem quickly enough can be hard