||ONE MILLION! Seriously? Wow.
I thought I could share two memories.
The first spans for a couple of years: Those days when my friends and I discovered TopCoder and started competing for fun. We were all programmers at an office without a boss around most of the time, and I remember some of us setting aside some time, a big "do not disturb" sign on top of your monitor, headphones playing Nightwish to block noisy co-workers (those who did work, you know) and spending two hours sweating and failing to solve problems. This was back on 2004, which kind of makes me a living fossil, and explain why we could place signs "on top of" our big, CRT monitors! By today most of us still write code, and work for many different companies (and keep at least a mention TopCoder in our resumes), and are still friends. Those happy days!
Next one is more like a moment. I was writer for some time, not too long. Coming up with a 1000ptr Div1 problem the hardest thing my brain could think of. The day "my" SRM was held, I was totally unsure: are my problems totally trivial? Or impossible? The moment system tests passed, and I saw exactly 6 correct solutions to that problem and everyone commenting our solutions from Petr, tomek, Eryx (my own big heroes at that time) is still a vivid memory!
There are really many more awesome moments. I am very thankful to TopCoder and its community for so much fun and learning.