CodeChef is a not-for-profit educational initiative started by Directi more than a decade ago. We started with a dream of seeing an Indian team winning a gold medal at the ACM ICPC World Finals. In its quest for the same, CodeChef has built a self-driven community of the world's best programmers. Today more than 1.3 million competitive programmers from 180+ countries learn from CodeChef. CodeChef has been hosting monthly programming contests regularly for 10 years now. Its platform has assessed 92 million+ code submissions to date, and over 30000 organizations are being impacted by CodeCheffers worldwide. It also organizes SnackDown - one of the world's largest global programming competition whose last edition drew participation from 140+ countries. Since 2017, CodeChef has started providing India's only industry-ready certification in Data Structures and Algorithms, and 1800+ programmers have been certified under the same.
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Have you heard of codeforces.com, atcoder.jp, codechef.com, etc? Source: almost 2 years 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: almost 2 years ago
Learn Java with hands-on experience. I personally used codingbat.com a lot, but I've heard good things about codechef.com, which appears to even have a competitive option. Source: over 2 years ago
For practicing algorithms, use any of the freely available websites like https://hackerrank.com https://codechef.com https://projecteuler.net A structured set of practice problems are available at https://www.interviewbit.com/courses/programming/ Avoid https://geeksforgeeks.org because it has a ton of material but very poor quality control. Source: about 3 years ago
These all have sample problems to solve Hackerrank.com edabit.com codewars.com codechef.com and there are tons more. Best of luck to you. I am at about the same level myself. I really like these sites. Source: over 3 years ago
...and throw this into diagram-generating tools like this one or this one to generate diagrams like this. Source: over 3 years ago
Given that code is truth, anything we can do to keep our documentation in line with our code is usually a good idea. If you can generate docs from your code, you minimize documentation drift as much as possible. Tools like JavaDoc or godoc make it easy to turn comments in code to HTML, text, or even man pages for the software. Standards like yuml allow teams to store easy-to-change and understand text documents... - Source: dev.to / over 3 years ago
LeetCode - Practice and level up your development skills and prepare for technical interviews.
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
HackerRank - HackerRank is a platform that allows companies to conduct interviews remotely to hire developers and for technical assessment purposes.
Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
CodeForces - Programming competitions and contests, programming community.
UML Designer - UML Designer provides a set of common diagrams to work with UML 2.5 models.