问题：设某个田径运动会共有七个项目的比赛，分别为100米、200米、跳高、跳远、铅球、铁饼和标枪。每个选手最多参加3个项目，现有六名选手参赛，他们选择的项目如表1-1所示。考虑到每个选手的参加的各个项目不能同时进行，则如何设计合理的比赛日程，使运动会在尽可能短的时间内完成？ -Question: Let the race for a total of seven projects Track Meet, respectively, 100 meters, 200 meters, high jump, long jump, shot put, discus and javelin. Up to each player to participate in three projects, the existing six contestants, their choice of items shown in Table 1-1. Taking into account the participation of each project can not be carried out at the same time each player is how well-designed game schedule, so games completed in the shortest possible time?