from __future__ import division

def median(x, use_float=True):
    # there exist better algorithms...
    y = sorted(x)
    left = (len(y) - 1)//2
    right = len(y)//2
    sum = y[left] + y[right]
    if use_float:
        return sum/2
    else:
        return sum//2

def shuffled(x):
    x = list(x)
    random.shuffle(x)
    return x