Somebody described a similar experience: they didn't get a professional feeling from the interview process. They received a call from an HR person, suffered through the regular set of HR questions, and were asked to take a skill test.

The skill test involved the same set of questions already described: filling in missing letters and string manipulation. It wasn't that difficult, especially given they let you pick a language out of Java, C, C++, and more.

After no feedback for a few weeks, they were then told they passed. I guess I missed a punctuation somewhere :)

You are to write a method getMissingLetters, which takes a String called sentence and returns all the letters it is missing (which prevent it from being a pangram).

A collection of particles is contained in a linear chamber. They all have the same speed, but some are headed toward the right and others are headed toward the left. These particles can pass through each other without disturbing the motion of the particles, so all the particles will leave the chamber relatively quickly.