// As a theater booking system with N seats (1...N), You made a mistake while assigning tickets. And it ended up assigning 2 tickets to everyone instead of 1.
// M (where M < N) people who tried to book the ticket in your theater got 2 tickets instead of 1.
// so basically all the people who wants to watch the show ends up with two tickets.
// - To solve this mistake you decided to be smart and figure out if it's possible to cancel just 1 tickets instead of re assigning tickets to everyone?
// - If it's possible to just cancel one ticket which ticket you will cancel? (return list which represent cancelled ticket for ith person at ith index )
// Example:
// N: 5
// bookings : (6,2) (1,2) (1,6) (2,3) (3,4) (5,2)
// answer:
// Yes,
// cancel (2,1,6,2,3,2)

// (1,2) (1,2) (2,1) (3,4) (5,7) -> no