I have a similar encounter but with coding competitions like topcoder and codejam. I had thought I was good. For some difficult problems, I couldn't even solve

I have a similar encounter but with coding competitions like topcoder and codejam. I had thought I was good. For some difficult problems, I couldn't even solve it after looking at the solution.. then, there were some people solving them within 20 minutes (including reading the question and coding up the correct solution). That's when I've learned that there are people who are that good.