Programming Problem Sets

Competitive Programming

• A Way to Practice Competitive Programming - Masataka Yoneda (PDF)

• A2 Online Judge

• Algorithms for Competitive Programming

• APL Problem Solving Competition

• AtCoder

• beecrowd

• COCI

• Codeabbey

• Codechef

• Codecombat

• Codeeval

• CodeFights

• Codeforces

• Codeground

• Coderbyte

• Codewars

• Codingame

• Competitive Programming Cheat Sheet

• CSES Problem Set

• Dimik

• DMOJ

• E-olymp

• Exercism

• HackerEarth

• Hackerrank

• Internet Problem Solving Contest

• Just another Golf Coding

• Kattis

• LeetCode

• LightOJ

• Meta Hackercup

• Newton School

• oj.uz

• Sigmageek

• Sphere Online Judge

• Techgig

• Topcoder

• Toph

• USACO.guide

Capture the flag

• ångstromCTF

• CTFlearn (email address requested)

• CTFtime

• echoCTF (email address requested)

• Google CTF (email address requested)

• Hacker101 (email address requested)

• Hackthebox (email address requested)

• HackThisSite (email address requested)

• InCTF

• Microcorruption

• Overthewire Wargames fungame to practice CTF

• Picoctf (email address requested)

• ringzer0ctf (email address required)

• ROP Wargame Repository

• SmashTheStack

• TryHackMe (email address requested)

Data science

• AIcrowd

• CodaLab

• CrowdANALYTIX

• DrivenData

• Kaggle

HTML and CSS

• Frontend Mentor (email address requested)

Ladders

• A2 Online Judge

• Atcoder Problems

• C2 Ladders

• Striver's A2Z DSA Course/sheet

• Striver’s CP Sheet

Problem Sets

• 500 Data structures and algorithms interview questions and their solutions in C++

• Advent Of Code

• AdventJS - 25 días de retos con JavaScript - Miguel Ángel Durán «midudev» (GitHub account requested, not required)

• Anarchy Golf

• APL Practice Problems

• BaekJoon Online Judge

• beecrowd

• CareerCup

• CheckIO

• Codechef

• Codedrills

• Codeforces

• Codility

• Coding Bat

• Coding Interview Questions and answers for practice | Python, Java & C++ - CodingNinjas

• Coding Ninjas Guided Paths

• CSES Problem Set

• DSA Learning Series

• Dynamic A2OJ Ladder

• Edabit

• Exercism

• Geeks For Geeks

• Grind 75

• Hacker.org

• HackerEarth

• HDU Online Judge

• Interactive Coding Challenge

• InterviewBit

• Kattis

• Mathproblem of the Month - Bilkent University

• PEG Judge

• Pep Coding

• PKU Online Judge

• Ponder This!

• Practice Python

• ProblemBook.NET

• Project Euler

• Python Practice Projects

• Rosalind

• Sphere Online Judge

• TalentBuddy

• The Ultimate Topic List(with Tutorials, Problems, and Templates) - Shahjalal Shohag

• Timus Online Judge

• Top Interview 150 - LeetCode

• Topic wise multiple choice questions in computer science - Geeks For Geeks

• UVa Online Judge

• Vulnhub.com

• Школа программиста