How do I search for a number in a 2d array sorted left to right and top to bottom?

Question

I was recently given this interview question and I\'m curious what a good solution to it would be.

Say I\'m given a 2d array where all the numbers i

Answer 1

As this is an interview question, it would seem to lead towards a discussion of Parallel programming and Map-reduce algorithms.

See http://code.google.com/intl/de/edu/parallel/mapreduce-tutorial.html