I thought of this problem today, and since I don't really have much problem-creating experience, I would like to hear the opinions of experienced problem creators on whether or not it would be a good div. 2 A. Feel free to try it if you would like. I have added the solution.

Problem:

One day, $$$n$$$ people are made aware of the website codeforces.com. Let's call this day day $$$0$$$. The day after day $$$0$$$ is called day $$$1$$$, the day after that is day $$$2$$$, and so on. If you randomly select $$$1$$$ of these $$$n$$$ people, what is the expected value of the absolute difference between the day they were made aware of codeforces and the day they created a codeforces account? If the expected value is too big to fit inside a 32-bit integer, output $$$-1$$$.

Input:

The first line of each test, $$$t$$$, is the number of testcases $$$(0 \le t \le 10^3)$$$. Each testcase consists of a single integer, $$$n$$$ $$$(1 \le n \le 10^6)$$$.

Output:

For each testcase, print the expected value. It can be shown that if the expected value is less than the largest 32-bit integer, the expected value is an integer itself.

for i in range(int(input())):
    input()
    print(-1)