Most students who fail C++ placement rounds don't fail because they can't code. They fail because they studied in the wrong order — jumped into DP before mastering STL, and memorized solutions instead of understanding patterns. This post fixes that. Here's a 5-level roadmap, each level building directly on the previous one. No filler. Why C++ in 2026? Product companies — Amazon, Microsoft, Flipkart, Razorpay — all accept C++. The STL alone ( map , set , vector , priority_queue ) solves 80% of interview problems faster than equivalent Java or Python code. Runtime is 2–5x quicker on timed OJs. 99% of Indian product companies accept C++ submissions. Starting fresh and targeting product companies? C++ is the call. Level 1 — Core Syntax & Memory Fundamentals Don't open LeetCode yet. Get fluent in C++ mechanics first. Topics to nail: References vs. pointers — difference matters in interviews Stack vs. heap — new , delete , memory layout Pass by value vs.…