"Two and a half men," the most watched comedy on television, will remain on CBS through 2012. In an unusual multiyear renewal, CBS said it had ordered three more seasons of that six-year-old sitcom. The network also ordered two more seasons of "The Big Bang Theory," ensuring that it will remain on the air through 2011. Both series are overseen by Chuck Lorre, the veteran sitcom writer, and produced by Warner Brothers .The multiyear deal indicates that Warner Brothers and CBS are preparing to settle a $49 million lawsuit involving "Two and a half men."