Circle of Numbers (CodeFIght)

Consider integer numbers from 0 to n - 1 written down along the circle in such a way that the distance between any two neighbouring numbers is equal (note that 0 and n - 1 are neighbouring, too).

Given n and firstNumber, find the number which is written in the radially opposite position tofirstNumber.

Example

For n = 10 and firstNumber = 2, the output should be

circleOfNumbers(n, firstNumber) = 7.

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int circleOfNumbers(int n, int firstNumber) {
    return (firstNumber+(n/2)) % n;
}