thanks u sir for your kind email i have understadn the prob fully by
your kindness but please sir there is a bit confusion here please sir
remove this confusiion by aswering theese questinons and please sir
expalin one of them please please
1) 1 2 2 3
2) 1 2 3 4 3
3) 1 1 0 3 4

The first test 1 2 2 3:
The answer is "YES".
For example, first Nick takes the card with numbers 0 and 1(it is
lexicografically the first card) and reas the number 1, after that he
take the card with numbers 1 and 2 (the second card) and reads number
2, after that he takes the card with numbers 2 and 3(the 3-rd card)
and again reads number 2 and on the end he takes the card with
numbers 3 and 4 and reads number 3.
So, he has tooken 4 different cards, and the answer is "YES".

The second test 1 2 3 4 3
The answer again is "YES"
For example:
First Nick takes the card with numbers 0 and 1(the 1-st card) and
reads number 1, after that the card with numbers 1 and 2(the second)
and reads number 2, after that he takes the card with numbers 2 and 3
(the 3-rd card) and reads number 3, after that the card with numbers
4 and 5 (THE FIFTH CARD) and reads number 4 and on the end the card
with numbers 3 and 4(the 4-th card) and reads number 3.
So all the cards are different, and the answer is "YES"
The third test: 1 1 0 3 4:
The answer is "NO"
As Nick has read number 0, that is right the first card(with numbers
0 and 1) as there's no other card with numbers 0 written on it. So
there are exactly 2 cards with number 1 on it:the first(with numbers
0 and 1) and the second (with numbers 1 and 2).As Nick has olready
tooken the first, there could be only one card with number 1 on it
and so only one "1" in the input - so this case is not possible 1 1
0......
the answer is NOT.
Hope this will help :)

Thanks also.
I've got ac,too.