By Ricardo Martins, IFSULDEMINAS Brazil
Two friends ask the attendant a snack bar propose a challenge , so that whoever hit him more , would not pay the bill. Then the following is proposed : Given the following sum below report the result , with the same number of terms : S = 1 - 1 + 1 - 1 + 1 - 1 + 1 - 1 ... Write a program that , given a number of terms, report the result of the sum above.
An integer C shall be informed , which is the amount of test cases. Each test case starts with an integer N ( 1 ≤ N ≤ 1000) , indicating the number of terms of the sum .
For each test case print a number S , which is the sum of N terms of expression.
|Input Sample||Output Sample|