basic-io.hpp

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#pragma once    // Source encoding: UTF-8 with BOM (π is a lowercase Greek "pi").

#   include <filesystem>       // std::filesystem::(path, ...)
#   include <fstream>          // std::(ifstream, ofstream)
#   include <iomanip>          // std::(setprecision, setw)
#   include <iostream>         // std::(cin, cout, cerr, clog, endl)
#   include <sstream>          // std::(istringstream, ostringstream)