| ||There is a number of people in a room, and each of them wears a hat which is either black or white.
Every person counts the number of other people wearing white hats. You are given a int count, the i-th element of which is the number counted by the i-th person. Return the total number of people wearing white hats, or -1 if count doesn't correspond to a valid situation.
|Method signature:||int whiteNumber(int count)|
|(be sure your method is public)|
|-||count will contain between 2 and 50 elements, inclusive.|
|-||Each element of count will be between 0 and 50, inclusive.|
|The first person wears a black hat and sees two people wearing white hats. Each person wearing a white hat sees only one other white hat in the room.|
|Everyone wears a white hat here.|
|Now that's interesting. There are only two people in the room, yet each of them counted 10 others.|