You can solve them with pen and paper. And yes, you are using algorithms then too but not in the same way as on a computer. But anyways I think you read the ti

You can solve them with pen and paper. And yes, you are using algorithms then too but not in the same way as on a computer. But anyways I think you read the title kind of opposite. Instead I think it is meant to reflect that algorithms and data structures, which in general have many uses, are here being used for the purpose of problem solving. I.e. to let readers know that it is specific.