Where can I learn DSA in C++ for free without video lectures?

Try cp-algorithms for written explanations, then use the free problems on LeetCode to practice the same topics. That's especially useful if you're preparing for interviews. You don't need a subscription just to get started with practice questions.

For a rough order, start with arrays and strings, hash maps, two pointers, stacks and queues, and binary search. Then move on to trees, graphs, heaps, and dynamic programming.

You can make your own syllabus without finding one perfect course. Read a topic, implement the core idea in C++, then solve three to five problems that use it in different ways.

Keep a small progress log with the topics covered and the mistakes you made. Note what assumption or invariant you missed, not just the right answer. That gives you something concrete to revisit when you get stuck on a similar problem.

Check whether your library has a free programming textbook, such as Introduction to Algorithms. A book can give you a structured route through the theory, though the depth and amount of math vary quite a bit between books. Pair it with coding exercises rather than only reading.

Don't treat the syllabus as a memorization checklist. The structures and algorithms are tools for different kinds of problems, so actually writing code with them matters more than trying to cram every topic at once.