In the previous chapters we have seen how time and space complexity of algorithms are determined and the
measure generally used for it, namely the asymptotic notation or the ‘O’ notation. We have also studied the
justifi cation for adopting such a measure in comparing various algorithms to do a particular job.
In this chapter, which in a way is a culmination of our detailed discussion, representing briefl y the result
of decades of work of computer scientists in the fi eld of algorithms, we present a bird’s eye view of questions
like – what is the nature of problems easy enough to solve, which ...
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