public class Solution {
    public static int minAvgTwoSlice(int[] a) {
        int idx = 0;
        double min = (a[0] + a[1]) / 2.0;

        for (int i = 0; i < a.length - 1; i++) {
            double cur = (a[i] + a[i + 1]) / 2.0;
            if (i + 2 < a.length) {
                double three = (a[i] + a[i + 1] + a[i + 2]) / 3.0;
                cur = Math.min(cur, three);
            }
            if (cur < min) {
                min = cur;
                idx = i;
            }
        }

        return idx;
    }
}