6. tennis

何も考えず実装。392byte。

p1 = p2 = 0
while(1):
	s = raw_input()
	if s == '1':
		p1 += 1
	elif s == '2':
		p2 += 1
	
	if p1 > p2:
		if p1 == 7:
			print 'Player1 wins the set %d - %d' % (p1, p2)
			break
		print 'Player1 leads %d - %d' % (p1, p2)
	elif p1 < p2:
		if p2 == 7:
			print 'Player2 wins the set %d - %d' % (p2, p1)
			break
		print 'Player2 leads %d - %d' % (p2, p1)
	else:
		print 'Set is tied at %d' % p1

縮めてみた。223byte。

_1=_2=0;w=' wins the set 7 - %d';l=' leads %d - %d';p='Player'
while(1):vars()['_%d'%input()]+=1;print{1:{7:p+'1'+w%_2}.get(_1,p+'1'+l%(_1,_2)),0:'Set is tied at %d'%_1,-1:{7:p+'2'+w%_1}.get(_2,p+'2'+l%(_2,_1))}[cmp(_1,_2)]

見にくい上にPython部門ランキングでダントツビリ。うーむ。