English version is in beta. All contents of the site should be already translated (mostly using machine translation), and everything should work properly. However, if you find any problems, please contact me.

Level 3

Simple greedy algorithms
Stack, queue, dequeue
*Standard data structures (STL, etc.)
Simple graphs
About the C++ language
About the codeforces website
Breadth-first search (BFS)
Basics of depth-first search (DFS)
Binary search