One-Swappable Array

July 24, 2015

Today’s exercise helps somebody with their homework:

Given an array of unique integers, determine if it is possible to sort the array by swapping two elements of the array. For instance, the array [1,2,6,4,5,3,7] can be sorted by swapping 3 and 6, but there is no way to sort the array [5,4,3,2,1] by swapping two of its elements. You may use O(n) time, where the array has n integers, and constant additional space.

Your task is to write a program that determines if an array can be sorted with a single swap. 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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