Prinsessejakt tweak

from sys import stdin    def besok(nabomatrise, node, besokt):    besokt[node] = True    for nabonode in xrange(0, len(nabomatrise)):        if nabomatrise[node][nabonode] == True and besokt[nabonode] == False:            besok(nabomatrise, nabonode, besokt)def main():    n = int(stdin.readline())    nabomatrise = [None] * n # rader    for i in range(0, n):        nabomatrise[i] = [False] * n # kolonner        linje = stdin.readline()        for j in xrange(0, n):            nabomatrise[i][j] = (linje[j] == '1')    for linje in stdin:        startnode = int(linje)        besokt = [False] * n        noder = 0        kanter = 0        besok(nabomatrise, startnode, besokt)                for node in range(0, n):            if besokt[node] == False:                noder += 1                for nabonode in xrange(0, n):                    if nabomatrise[node][nabonode] == True and besokt[nabonode] == False:                        kanter += 1                if noder == 0:            print '0.000'        else:                            print "%.3f" % ((float(kanter) / float(noder**2)) + 1E-12)main()