Based on our record, CodeForces seems to be a lot more popular than Kattis. While we know about 74 links to CodeForces, we've tracked only 2 mentions of Kattis. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
This is also why many people will suggest you find a project. As it will start you programming somethin and very often something you have some kind of passion or need for. But if you cannot think of a project to do, then I would look for guided projects or programming gamified like kattis.com or leetcode.com. I would highly suggest you do not watch tutorials without coding anything, as this is almost always wasted... Source: 5 months ago
Have you been on https://kattis.com? It’s full of C++ practice exercises that you can sort by level of difficulty and run through tests to check. My teacher had us use it for practice. Hope it helps! Source: over 1 year ago
Have you heard of codeforces.com, atcoder.jp, codechef.com, etc? Source: 5 months ago
Leetcode is good to learn basic algorithms because problem statements are usually straightforward. Competitive programming has much wider range of problems. Most popular sites for cp are codeforces.com , atcoder.jp, codechef.com . Source: 5 months ago
The de facto standard community for competitive programmers, regular contests with editorials, huge archive of problems (https://codeforces.com/problemset) with pretty accurate difficulty ratings so you can focus on problems of suitable difficulty if you want to progress quickly. They also have an incipient EDU section: https://codeforces.com/edu/courses that covers basic algorithms with practice problems. - Source: Hacker News / 7 months ago
- I used C++ to solve 500+ problems on codeforces.com (a competitive programming website) But I'm rusty now. Source: 9 months ago
Join the codeforces.com cult try out some most solved problems and then there are many other things like cses problemset, a2oj ladders... Just a tip learn c++ stl too (not necessarily now but do it soon). Source: 11 months ago
Codewars - Achieve code mastery through challenge.
LeetCode - Practice and level up your development skills and prepare for technical interviews.
CodeSubmit - Make Better Hiring Decisions Real-World Technical Interviews
Codechef - CodeChef is a not-for-profit educational initiative by Directi, an Indian software company. It is a global programming community that fosters learning and friendly competition, built on top of the world’s largest competitive programming platform.
Codecademy - Learn the technical skills you need for the job you want. As leaders in online education and learning to code, we’ve taught over 45 million people using a tested curriculum and an interactive learning environment.
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.