PyInfo
184 articles · every code sample is tested

Theory

Learn the language, then the algorithms. Each article explains the idea, proves why it works and gives a complete Python implementation you can paste into the editor.

Where to start

A suggested order if you are new. Skip whatever you already know.

  1. 1Python FundamentalsNever coded, or new to Python
  2. 2Python for ContestsComfortable with Python, new to contests
  3. 3Graph AlgorithmsReady for algorithms

Foundations

Learn Python and the toolkit you need to solve problems fast.

Python Fundamentals

From your first program to classes and comprehensions: the language features every solution is built on.

15 articles~59 min
0/15

Python for Contests

Fast input, the right standard-library tools and the performance traps that decide whether a solution passes the time limit.

5 articles~22 min
0/5

Algorithms & Data Structures

The classic competitive-programming curriculum, explained and implemented in Python.

Number Theory & Algebra

Divisibility, primes, modular arithmetic and the bit tricks behind many olympiad problems.

29 articles~180 min
0/29

Data Structures

Structures that answer range queries and maintain sets under updates in logarithmic time.

10 articles~85 min
0/10

Dynamic Programming

Turn exponential recursions into polynomial algorithms by remembering subproblems.

7 articles~45 min
0/7

String Algorithms

Hashing, pattern matching, suffix structures and palindromes: the toolbox for text problems.

12 articles~93 min
0/12

Graph Algorithms

Traversals, shortest paths, spanning trees, connectivity and matchings on graphs.

48 articles~332 min
0/48

Linear Algebra

Solve linear systems and compute determinants and ranks with Gaussian elimination.

4 articles~31 min
0/4

Computational Geometry

Points, lines, polygons and circles: the basic operations and the classic algorithms built on them.

26 articles~185 min
0/26

Combinatorics

Counting objects without listing them: binomials, Catalan numbers and inclusion-exclusion.

10 articles~59 min
0/10

Searching & Numerical Methods

Binary search on arrays and on answers, ternary search and iterative root finding.

5 articles~32 min
0/5

Games & Miscellaneous

Game theory, cycle detection and other classic tricks that do not fit elsewhere.

13 articles~89 min
0/13

The algorithms tracks are Python adaptations of articles from cp-algorithms.com, shared under CC BY-SA 4.0. See the notice at the bottom of each article.