A little over halfway down the page he starts to present the pseudo code to solve this game called boggle. I'm confused on what he means by this sentence
Check if
currentletterisq, in which case insert a new letter intonextheapcontainingu, and the same coordinates and pointer member ascurrentletter.Restore the trail of
currentletter:*
I would appreciate it if someone could clarify what q and u are and what that check is trying to achieve.