ProfitLeader

This algorithm is to rank important nodes in networks by a measure to quantify the profit that a node can povide. File: ProfitLeader.java include test function, and Node.java is just a data structure. dealData.java is to handle initial file so that class ProfitLeader can deal it directly. Otherwise, the code is corresponding to paper <ProfitLeader: Identifying Leaders in Networks with Profit Capacity> by Zhongjing Yu et al.