Two Swaps

October 23, 2015

Today we have one of those tricky interview questions that are easy once you know the answer:

You are given an array of three elements, in some random order. You must sort the array into increasing order, but may only use two swaps. How can you do it?

Your task is to write a program that sorts a three-element array with only two swaps. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exercise in the comments below.


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