Applied through career website.

Got an email several days later and was asked for an online code challenge, then a Skype interview.

The interviewer set up an online environment. He would compile our code on his own laptop and tell you where the problem is.

I coded the question smoothly by using a stack instead of recursion. I believed I answered the question without a mistake, then got rejected with no reason.

Really confused about their selection policy. I bet is that they are more looking for a culture fit, or there is no head count at the end of the year.

Write code to find the largest connected section of a matrix.

X X X X O X

This would return 5, since there are 5 connected Xs.

X O X O O X X O X

This would return 4, since there are 4 connected Os.