The number of movements=the number of lines in the graphs+the numbers
of subgraphs(except the subgraphs with only one point)-1.Isn't it
correct?
But i got a WA. What's the matter?

> The number of movements=the number of lines in the graphs+the
numbers
> of subgraphs(except the subgraphs with only one point)-1.Isn't it
> correct?
> But i got a WA. What's the matter?

This is my solution too . I got WA . And I don't know why .
Maybe your error is this : if the grapf has 0 edges ...
Here is a test :
3 1
1
2
3

The solution is 0 not -1 .

Thank you very much I just change -1 to 0 then get accepted. If you still wa i can give you my program.