Introduction
I had a mock interview 12:00 PM. As a programmer I cannot tell the peer is an excellent programmer until the peer wrote one line of code but I could not understand. So I asked the peer what is the meaning to turn the positive number to negative number, and the peer told me that he likes to mark the index is found.
I have practiced this algorithm over 5 times, but I never came cross this idea.
Code review
Here is C++ code for the algorithm.
My last practice in Nov., 2017 is here.
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