from random import *

pairs = 50
magicCode = 4589
totalGets = 0
experRepeats = 100

basket = []
completed = []
checkedout = []

def initialize():
	global basket, completed, checkedout, totalGets
	basket = [magicCode+2*i for i in range(0,pairs)] + [magicCode+2*i+1 for i in range(0,pairs)]
	completed = []
	checkedout = []
	totalGets = 0

def emptyBasket():
	return basket==[]

def getSock():
	global basket, totalGets, checkedout
	
	assert(not emptyBasket())
	i = randint(0,len(basket)-1)
	# print i
	sock = basket[i]
	del basket[i]
	checkedout = checkedout + [sock]
	totalGets = totalGets + 1
	return sock

def match(sock1, sock2):
	global checkedout, magicCode, completed
	
	# print "matching", sock1, "and", sock2
	assert(sock1 in checkedout)
	assert(sock2 in checkedout)
	assert(sock1 != sock2)
	if (sock1-magicCode)/2 != (sock2-magicCode)/2: return False
	
	i1 = checkedout.index(sock1)
	del checkedout[i1]
	i2 = checkedout.index(sock2)
	del checkedout[i2]
	completed = completed + [[sock1,sock2]]
	# print "...matched"
	return True

def replaceSock(sock):
	global checkedout, basket
	
	assert(sock in checkedout)
	i = checkedout.index(sock)
	del checkedout[i]
	basket = basket + [sock]

# 4953
def sorter1():
	x = getSock()
	y = getSock()
	if not match(x,y):
		replaceSock(x)
		replaceSock(y)

# 2485.73
def sorter2():
	x = getSock()
	y = getSock()
	while not match(x,y):
		replaceSock(y)
		y = getSock()

# 1309.62
def sorter3():
	x = getSock()
	y = getSock()
	pile = []
	while not match(x,y):
		pile = pile + [y]
		y = getSock()
	for sock in pile:
		replaceSock(sock)

# always 100
def sorter4():
	emptySpot = 0
	pile = []
	while not emptyBasket():
		x = getSock()
		matched = False
		for i in range(len(pile)):
			if not matched and match(x,pile[i]):
				matched = True
				del pile[i]
		if not matched:
			pile = pile + [ x ]

# grab 3
def sorter5():
	x = getSock()
	y = getSock()
	if emptyBasket(): match(x,y)
	else:
		z = getSock()
		if match(x,z):
			replaceSock(y)
		elif match(y,z):
			replaceSock(x)
		elif match(x,y):
			replaceSock(z)
		else:
			replaceSock(x)
			replaceSock(y)
			replaceSock(z)

# alternative to sorter4
def sorter6():
	pile = []
	while not emptyBasket():
		x = getSock()
		pile2 = []
		matched = False
		while not matched and pile != []:
			y = pile[0]
			pile = pile[1:]
			if match(x,y):
				matched = True
			else:
				pile2 = pile2 + [y]
		pile = pile + pile2
		if not matched:
			pile = pile + [ x ]

sorter = sorter5

# 100.0
def experiment():
	global experRepeats, totalGets
	allRuns = []
	for i in range(experRepeats):
		# print "EXPERIMENT", i
		initialize()
		while len(completed) < pairs:
			sorter()
		allRuns = allRuns + [totalGets]
	return allRuns

x = experiment()
print "mean", sum(x)/(0.0+len(x))
print "max", max(x)
print "min", min(x)