Man pages matching name std::ranges::input_range in section 3cxx:

std::ranges::input_range.3cxx.en	debian 12 / libstdc++-12-doc
std::ranges::input_range.3cxx.en	debian 13 / libstdc++-12-doc
std::ranges::input_range.3cxx.en	debian 13 / libstdc++-13-doc