I built a website to share solutions to coding competitions, including Codeforces, TopCoder, and UVa Online Judge.
The site is http://codingyard.com/
I've been working on it as a side project, and it is completely free to use. I pay the bills and will continue to pay it.
If people can pay a visit, sign up, and leave some feedback, I would much appreciate it!
Even though Codeforces already provide a way to view past solutions, I built the website for below reasons
1) A centralized place to store solutions to multiple contests.
I think many people who do competitive programming participate in multiple compeititons — Codeforces, TopCoder, Google Code Jam, etc. I plan to support uploading solutions as many different competitions as possible. I eventually want to turn my website into a community where people can come to share solutions to any competitions.
2) Some competition sites don't show previously submitted solutions. One example is UVa Online Judge. Sometimes I would get stuck on a problem and I really wish I could see other people's solutions so that I see other possible approaches.