多项式求和 Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 63584    Accepted Submission(s): 36569 Problem Description 多项式的描述如下:1 - 1/2 + 1/3 - 1/4 + 1/5 - 1/6 + ...现在请你求出该多项式的前n项的和.   Input 输入数据由2行组成…