dear friends, I use DP and get WA on test 5, I am very curious to get the reason why, I tried many test cases but it works here, I read somewhere that maybe everywhere is not '-1'. Is it really like that? Also I write each answer after reading, can it be reason?
Thanks...

gamarjoba :)
sad swavlob? Tu ar dagezareba, eyler11@rambler.ru aris Cemi meili da gamomexmaure :)