Resource library
Curated material for every level, reviewed by the olympiad's coaches.
CourseL1L2L3★ Coaches' pick
USACO Guide
Structured curriculum from Bronze to Platinum with problems and explanations.
usaco.guideEnglish
Problem setL1L2★ Coaches' pick
CSES Problem Set
Over 300 problems grouped by topic; core practice for every level.
cses.fiEnglish
CourseL2★ Coaches' pick
Codeforces EDU
Interactive lessons: binary search, two pointers, DSU, segment tree.
codeforces.comEnglish
Problem setL3★ Coaches' pick
oj.uz
Judge with IOI, APIO, BOI, CEOI and JOI problems.
oj.uzEnglish
CourseL1
France-IOI
Graded exercises for beginners (levels 1 and 2).
france-ioi.orgOther language
Problem setL2
AtCoder DP Contest
26 problems covering the classic dynamic programming patterns.
atcoder.jpEnglish
ArticleL2L3
cp-algorithms
Written reference for algorithms and data structures.
cp-algorithms.comEnglish