def cpp( path: str ) -> str:
    defined = set()
    out = ''
    emit : list[ bool ] = []

    def process( line: str ) -> None:
        if line.startswith( '#ifdef' ):
            cmd, macro = line.split()
            emit.append( macro in defined )
        if line.startswith( '#endif' ):
            emit.pop()

        if not emit or emit[ -1 ]:
            if line.startswith( '#define' ):
                cmd, macro = line.split()
                defined.add( macro )
            if line.startswith( '#undef' ):
                cmd, macro = line.split()
                defined.remove( macro )
            if line.startswith( '#include' ):
                cmd, path = line.split()
                read( path[ 1: -1 ] )

    def read( path: str ) -> None:
        nonlocal out
        with open( path, 'r' ) as f:
            for line in f:
                if line[ 0 ] == '#':
                    process( line )
                else:
                    if not emit or emit[ -1 ]:
                        out += line

    read( path )
    return out

if __name__ == '__main__':
    import sys
    if len( sys.argv ) >= 2:
        print( end = cpp( sys.argv[ 1 ] ) )
        exit( 0 )

import run_tests