Resources
USACO
- Official Site (usaco.org)
- USACO Guide
- Problems Spreadsheet
- Tracker Spreadsheets (by level)
- Unofficial USACO Syllabus
- Practice Method Guide
- IOI Syllabus
Other Contests
- Codeforces
- AtCoder
- CodeChef
- DMOJ
- Google's Coding Competitions
- Meta Hacker Cup
- Topcoder
- Contest Calendar (has non-CP comps as well)
Algorithms
Books
- Competitive Programmer's Handbook
- Competitive Programming 3
- Principles of Algorithmic Problem Solving
- The Hitchhiker's Guide to the Programming Contests
- An Introduction to the USA Computing Olympiad (Java)
- An Introduction to the USA Computing Olympiad (C++)
- Dynamic Programming for Computing Contests
- Crash Course Coding Companion
Youtube Channels
- Algorithms Conquered
- Algorithms Live!
- benritmicocode
- Codeforces With Java
- Colin Galen
- Dardev
- Errichto
- Jonathan Paulson
- luis enrique vargas azcona
- Code Tree (in Korean)
- MIT OpenCourseWare
- Niema Moshiri
- SecondThread
- Stable Sort
- Stefan Dascalescu
- Riya Arora
- William Lin
- WilliamFiset