Gettin' wrong answer. Can anybody post it, please!?

10 2 5 1
1 6
1 4
4 5
5 8
7 9

Answer:
5
1 2 3 4 5
May be test 7 is another thing.I don't know exactly.

Edited by author 16.05.2009 11:57

I got wa7 too. But my algo give right answers in all tests at timus :( I use sort and greedy :( I don't understand why sort and greedy not work?

this is not test 7
this test works for me
i also use sort + greedy and i dont know why i get wa7

Try this one:
10 3 5 1
1 2
1 5
1 7
6 8
4 9

The answer is:
5
1 2 3 4 5