说明：  netlong程序，应用的课题方向：博弈上的合作，尤其是奖励和惩罚在合作中的角色。可以直观地发现合作水平的演化。做这方面课题时只需少量修改即可。
(netlong program, the direction of the subject of the application: Game on cooperation, in particular, is the role of reward and punishment in cooperation. Intuitive to find the evolution of the level of cooperation. Only a few changes can do in this regard subject.)