By using c++, Assume you are building a database for the school football team. People are constantly being enrolled and dropped out of the team. Your job is to keep track of the players. The players can be identified by their assigned 3-digit number (eg. 759, 412). Build a system using the most appropriate data structure following the sample output.

Sample output: Inserted! Inserted! Inserted! Number of players: 3 No. : 596, 132, 328 Dropped! Number of players: 2 No. : 132, 328