So, I gather that you treated your solutions as throw-away code, rather than keeping them? Kind of surprising, considering that some problems build off of each other, or otherwise benefit from sharing code; you never know when the code for one solution could be useful later. For example, a prime number generator/tester is necessary for many of the problems.

(I have all my solution code, in source control no less, so if I ever lost my account, I could just run them all and re-enter the solutions.)