Hello, codeforces! If you have forgotten from STL or you are a beginner programmer who wants to learn programming, take a look at such sites. They will teach a lot about programming! Let's guys learn how to program well and we can change the story codeforces!

Site:

e-maxx

geeksforgeeks

our favorite is codeforces

informatics

cplusplus

cppreference

These sites will help you in programming! Good luck :)