What is the most beautiful rating graph have you ever seen?

Hi everybody!

What does this 'Constractive Algorithms'?

Are they ad-hoc problems or something else?

Hi all! Why main.edu.pl doesn't work?

In 'Recent actions', having 'New' notice would be really nice!

Hey there!

I think everyone know what does this piece of code do:

vector <int> v = {1, 2, 3, 4};
for (int x : v)
  cout << x << " ";

prints: 1 2 3 4

Is there any way to do this in reverse order ?!

Hey guys!
You can easily make your contest unofficial during contest. To do this you should ask your friend or someone else to give his code. Then submit it (don't change anything). After the contest your contest will be unofficial. No rating loose.

What's the time complexity of substr() function in C++? I've tried this code by entering the string of size 10^5 , but it worked in less than one second.

If we go this way there won't be any available logins to our children or our grandsons :))

Where can I find past IOI's problems and where to submit them ?! Please help !!!

Hello everyone! I'm new on codeforces and programming. It's my first blog entry. Sorry for my mistakes. I know some algorithms but I can't use them in contests. I ask you books for easy (beginner) or (elementary) algorithms that every programmer should know. I would be glad if someone helps me to be a good programmer. I want to solve at least 3 or 4 problems from div2. I know that it is not impossible.