This example demonstrates how to parse a URL query string, such as `key=val&key_2=val_2&key_3=val_3`, into a map of key-value pairs using C++ standard library components. The code iterates through each character, distinguishing between keys and values based on `=` and `&` delimiters, and writes the results into a `std::map<std::string, std::string>`. It relies on `std::ostringstream` for building substrings and `std::map` for ordered storage. This is a pure text-processing utility with no visualization or rendering libraries; it focuses solely on data preparation.