Six underused C++ standard library headers that simplify everyday coding

A junior C++ learner has highlighted six often-overlooked headers in the C++ standard library that can replace verbose, hand-written code with concise one-liners. Headers such as numeric and algorithm offer functions like std::accumulate, std::gcd, and std::nth_element, which handle common tasks including summation, GCD calculation, and partial sorting efficiently. C++17 additions like std::string_view and std::optional allow developers to pass strings without copying and handle nullable return values without relying on sentinel values or exceptions. std::bitset simplifies bit manipulation operations, while std::tuple combined with structured bindings enables functions to return multiple values cleanly. The writeup targets beginners and intermediate programmers who may be unaware of these built-in tools despite their practical value in both general and competitive programming.