/**
 *Given a stream of integers and a window size, calculate the moving average of all integers in the sliding window.
 *For example,
 * MovingAverage m = new MovingAverage(3);
 * m.next(1) = 1
 * m.next(10) = (1 + 10) / 2
 * m.next(3) = (1 + 10 + 3) / 3
 * m.next(5) = (10 + 3 + 5) / 3
 * Input :  ["MovingAverage","next","next","next","next"]
 *          [[3],[1],[10],[3],[5]]
 *
 * Output : [null,1.00000,5.50000,4.66667,6.00000]
 * Complexity: O(1) time, space O(n) where is the given size of the array.
 */
public class MovingAverage {

    /** Initialize your data structure here. */
    int[] arr;
    int index = 0;
    double res = 0;
    int start = 0;
    public MovingAverage(int size) {
        arr = new int[size];
    }
    public double next(int val) {
        //  keep a constant size to divide once we reach length - 1
        if ( start < arr.length) {
            start++;
        }
        res -= arr[index];
        res += val;
        arr[index] = val;
        index = (index + 1) % arr.length;
        return res / start;
    }
}

/**
 * Your MovingAverage object will be instantiated and called as such:
 * MovingAverage obj = new MovingAverage(size);
 * double param_1 = obj.next(val);
 */

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format fix