The problem gives you a sample input data file containing the all the employee-employer relationship information of a company. For example "Peter, John, 2013, software developer--John, NULL, 2012, CEO--David, Peter, 2014, technician..." means there are 3 people int this company (segmented by '--' ), the first 1 is Peter, his boss is John, he entered the company in 2013 as a software developer. The second is John as CEO, with no boss, the third is David as technician, his boss is Peter. The problem is asking you to output a file with all the information in a hierarchic style. I selected C++ as my language. But I found it might be quite efficient if we use mysql in this problem.