Summer Associate Intern

First question was to predict output for a given coding snippet.
After that I was given a question to find out the number of directories, files and size of directory when input is a directory path. The original question involved multithreading - but he asked me to solve it recursively at first. I wrote a program and he tested it against various paths. There was a small difference when it came to larger folders. He told that if there is an interview, they would get back to me. Unfortunately, I think they got a better candidate and that could be the reason why they didn't call me for further rounds.