public boolean unLinkVertexDist(){
		if(rigthDist.getID() == id){
			leftDist=this;
			rigthDist=this;
			return true;
		}else{
			leftDist.setRigthDist(rigthDist);
			rigthDist.setLeftDist(leftDist);
			leftDist = this;
			rigthDist = this;
			return false;
		}
	}