package com.thealgorithms.maths;

import java.util.Arrays;

/**
 * Wikipedia: https://en.wikipedia.org/wiki/Median
 */
public class Median {

    public static void main(String[] args) {
        assert median(new int[] { 0 }) == 0;
        assert median(new int[] { 1, 2 }) == 1.5;
        assert median(new int[] { 4, 1, 3, 2 }) == 2.5;
        assert median(new int[] { 1, 3, 3, 6, 7, 8, 9 }) == 6;
        assert median(new int[] { 1, 2, 3, 4, 5, 6, 8, 9 }) == 4.5;
    }

    /**
     * Calculate average median
     *
     * @param values number series
     * @return median of given {@code values}
     */
    public static double median(int[] values) {
        Arrays.sort(values);
        int length = values.length;
        return length % 2 == 0
            ? (values[length / 2] + values[length / 2 - 1]) / 2.0
            : values[length / 2];
    }
}