there n lecture m seminar conduct today Faculty Approximate Sciences the ith lecture start a_i end b_i formally time lecture span interval a_i b_i right bind exclusive the jth seminar start p_j end q_j similarly time seminar spans interval p_j q_j right bind exclusivethere x HDprojectors number 1 x y ordinary projector number x 1 x y available faculty Projectors distribute way HDprojector lecture projector ordinary HD seminar projector ordinary HD event moment time projector select event duration event projector reuse follow event start early current event finish you find distribution projector existsagain note right bind event time range inclusive event start exactly event finish projector reuse suppose instantly transport location event