How to learn and memorize algorithms efficiently? I always feel that I have read some algorithms several times but still haven't memorized them. Many algorithms I learned a year ago, I can't write them right now.

Can someone provide an effective method to learn and memorize algorithms? Thanks.

In the rules, it says that

“You may change your handle only ONCE. So think twice before. You will not be able to change it back.”

does it means that i can only change my handle once a year or does it means i can just change my handle for ONCE in all time.

is it possible to set a password for gmail-login account?