import time
import random


def timespent(listLen):
    """
    Creates list and calculates the time needed to make it

    Args:
        :param listLen: length of the tested list
    Returns:
        :param result: the time it took to make the list
    """
    testList = []
    for x in range(listLen):
        testList.append(random.randint(0, 1))

    startTimeO2 = time.time()
    laskuri = 0
    for x in range(listLen - 1):
        for y in range(x + 1, listLen - 1):
            if testList[x] == 0 and testList[y] == 1:
                laskuri += 1
    endTimeO2 = time.time()

    startTimeO = time.time()
    laskuri = 0
    nollat = 0
    for x in range(listLen - 1):
        if testList[x] == 0:
            nollat += 1
    else:
        laskuri += nollat
    endTimeO = time.time()

    timeToO2 = startTimeO2 - endTimeO2
    timeToO = startTimeO - endTimeO
    return timeToO2, timeToO


if __name__ == "__main__":
    print(timespent(10**2))
    print(timespent(10**4))
    print(timespent(10**5))