We have today another of our unlimited supply of interview questions: this one supposedly comes from Amazon:

Given an array X[0..n-1] of integers sorted into ascending order with no duplicates, find an array item that is also its index, so that X[i] = i.

For example, X[3] = 3 in the array shown below:

i     0 1 2 3 4 5
x[i] -3 0 1 3 5 7

Your task is to write a program that finds i. When you are finished, you are welcome to read or run a suggested solution, or to post your own solution or discuss the exericse in the comments below.

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