http://laputa.cs.shinshu-u.ac.jp/~yizawa/InfSys1/basic/chap6/index.htm
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I