[jedmeyers]

I've had a similar problem with one of more recent HackerRank challenges. Part of the input were value pairs, the example contained only two pairs and the ordering of the pairs was not clearly specified, ie it could have been:

x1 x2 x3

y1 y2 y3

or:

x1 y1

x2 y2

x3 y3

The worst part way that their example still produced the same result if you read the values in the wrong order! I spent 40 minutes debugging my solution not understanding why my test cases work perfectly but HR does not accept the solution.