Given an integer N and an array seats where N is the number of people standing in a line to buy a movie ticket and seat[i] is the number of empty seats in the ith row of the movie theater. The task is to find the maximum amount a theater owner can make by selling movie tickets to N people. Price of a ticket is equal to the maximum number of empty seats among all the rows. Example:
Approach: This problem can be solved by using a priority queue that will store the count of empty seats for every row and the maximum among them will be available at the top.
Create an empty priority_queue q and traverse the seats array and insert all element into the priority_queue.
Initialize two integer variable ticketSold = 0 and ans = 0 that will store the number of tickets sold and the total collection of the amount so far.
Now check while ticketSold < N and q.top() > 0 then remove the top element from the priority_queue and update ans by adding top element of the priority queue. Also store this top value in a variable temp and insert temp – 1 back to the priority_queue.
Repeat these steps until all the people have been sold the tickets and print the final result.
Below is the implementation of the above approach: