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多项式求和

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 161300    Accepted Submission(s): 90209


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,首先是一个正整数m(m<100),表示测试实例的个数,第二行包含m个正整数,对于每一个整数(不妨设为n,n<1000),求该多项式的前n项的和。
 

Output
对于每个测试实例n,要求输出多项式前n项的和。每个测试实例的输出占一行,结果保留2位小数。
 

Sample Input
2 1 2
 

Sample Output
1.00 0.50
 

Author
lcy
 

Source
 

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